Probably most of the work in steps 8-25 is painting and 'eyeballing' (no pun intended) the result. Unless you've done that sort of work before, you're probably not gonna be able to get a good result with those guidelines.

I've seen alot of his tutorials before, and all of them have the same flaw. He may be a very good 3d artist, but he is a poor tutorial writer. Often you have to know exactly how to make the thing to be able to comprehend all the steps.