1. Once you have the ME3Tweaks Mod Manager installed to begin use gameplay-altering mods, create a backup of you games before you install anything. You can find this in the Backup tool under the Backup & Restore tab. If you mess up at all in your modding process or want to install gameplay mods after already installing a texture mod... This will save you a massive amount of time for the small trade off of some extra space.

2. Install all the gameplay mods you want. If you are using this mod, make sure to install all of the required mods. Always install the Community Patches for their respective game's first.

3. After this is done and you are SURE that you have all the gameplay mods you want AND you have tested them in game with no issues - Open up the MEM. Navigate to whichever game you want to play first and therfore texture mod first, usually ME1. Select Texture Manager. It will then prompt you saying it need to do a scan the game's textures and you should have installed gameplay/doc mods you want. Let it scan and wait until it is done and you can navigate in the Texture Manager. Exit the Texture Manager.

4. Now you can install this mod or whatever texture mod you want for ME1. To do this select under Mass Effect 1, Texture Modding and select Install Texture Mods. Now select Add to List and navigate to respective the LE1 MEMs you want to install. If you are using the All in One version of this mod, it should be one simple file. One you have done that, select Install all mods and the textures should begin installing. This might take some time depending on your computer. One it is done though you can exit the mod installer.

5. Now that you have completed this for one game, you can continue to do the same steps with each respective game! Remember to select each corresponding texture mod version for each game you are installing for. Ie. Primitives (LE2) for ME2/LE2.

You have successfully installed your texture mods! You can continue to keep installing texture mods and using the Texture Manger to replace textures anytime... But keep in mind you will have to restore your game if you add/remove any gameplay mods.

Okay to start with... There are two methods of using the MEM that allow you to control precisely what texture you install.
The first is to create your own .mem texture package. You will need to collect the texture files you want to install in a folder named whatever. I have provided these texture files in the Seperate Installation version of this mod. They are organized to be easy to find whatever textures you want. Once you have that folder of textures you want installed, either all of them or some of them... In the MEM, Select Texture Modding under the corresponding texture's game. Select create texture mod. You will then navigate to that folder you created and select it. Once you do, it will ask you to name the new .mem and navigate to the location where you want it to be made. This can be anywhere, including your folder with textures. Once you have done this, it will create the .mem. Once this is done you can install that .mem the same way you did using this mod's installation directions.

The second way to install specific textures is by individually replacing them using the Texture Manager. This might be more difficult for anyone who has zero texture modding experience, since this is the same way modders mod textures. If you this is too hard to follow, then just do the first method.

So go to the Texture Manager under your respective game. Here you can individually examine and interact with the game's textures, which are loacted in larger game files you can scroll through on the left side. We will want to be finding spesific textures though, so the Search for a texture tool will be our friend. So select search and it will prompt you to enter the name of the texture you want to find. Let's do Ashley's texture, just for example. So the name of ashley's diffuse complexion texture is: HMF_HED_PROAshley_Face_Diff_Stack_0x763FC1C6.dds
You can copy and paste this texture into the bar and it should take you directly to that texture in your game. Or if you want to find any of Ashley's textures you can enter a shared keyword used in the name like *ashley* and that will pull up multiple for you to choose. The * symbols basically indicates that other characters can precede or follow the ones given when searching. Anyways... When you have located whatever texture you want to find can right click the file name and you nasically have the options to "replace" or "extract". Extracting means that you create an actual texture file copy of the one in your game - it is what I used to export this mod or create specific vanilla backups of textures. Replace allows you to select another texture file to... Well replace that one. This is essentially what installing is, just by a spesific texture by texture basis, and is useful when you are editing textures and don't have time to package everything. You can use this function to individually find and replace each texture you want in game. And you can use it with my textures to only install one texture at a time.

If you encountered any problems, you can feel free to let me know... But honestly a lot of this kind of process is best helped through discord servers for ME modding. That is where I learned most of this information, I'm just reguritating it the best I can so anyone can do this on their own. So yeah... Best of luck and if you are genuinely wanting to learn about all of this, there are many in the ME Discord servers who are much better at helping and explaining things than I am.