Look for the tutorials on nurbs patch models. Specifically, the ones for faces. I knew a lot about patch modeling, but I learned a lot really quick when I read through a few of these tutorials. There is one tut about patch modeling a dino face. If you read through it, you will find that the basic outline of each patch was drawn before the other curves were added. This is very useful I think because you get the basic shape of the head before you begin adding intricate detail. Don't create all the curves at once. Create a few (the outlines of each patch), model a little, add a few more curves, model a bit more, then add the rest. Then you can perform the final loft.