User blog comment:Snfonseka/Mass Effect 3 Modding Guide/@comment-85.183.153.219-20130501143721/@comment-74.214.63.191-20130525175708

It depends on what you are trying to do. Here are 2 links to great tips (I just spent a week modding hair and face to get the custom FemShep look I wanted. I learned a lot!):

1) http://www.masseffect2faces.com -- click on "Modding" link for tips on smoother facial look and other advice

2) http://social.bioware.com/forum/1/topic/325/index/9996307/1 -- How to Use the Default ME3 Femshep Facial Textures

Good Luck!