Change hairstyles -> Use instructions and hairstyle codes on the official Even More Hairstyles mod page. 
Credits to Moraxix for the Even More Hairstyles Mod. 

To change skin tone. Use Trilogy Save Editor.

Backup your save files. Open the latest save file in Trioligy save editor. 

Go to Headmorph Tab->Vector Parameters->Skin Tone. Set custom skin tone color to your liking with color picker.