This is now your path to ruin, where you are going to have to learn a really fun application for free. Blender is a very well put together program, and like ZBrush its interface and instruction manual somehow got lost along the way. So now I will pass on my years of learning the program to you the viewer. Let’s take a break from ZBrush and start learning Blender; at the end of this chapter you will see how Blender and ZBrush can work together (Yes, the UV thing).

LINK:
http://www.3dtotal.com/team/Tutorials_3/zbrush_training/lesson_09/zbrush_lesson_09.asp