I've never once hired someone to fit or clip for me or my siblings...I think it's much more fufilling (not to mention easier in the checkbook) to learn to do it yourself. The best thing you can do is keep practicing, you can get a lot better at it in a hurry if you pay attention to where you made your mistakes..I learn something new every time I pick up a set of clippers, and I've clipped a lot of cattle. I've never personally taken a Stierwalt class, but he IS the best out there at teaching to a big group. I highly encourage going to the camp, or at the very least, getting the videos.
I wish my first clip job looked as good as that, it was a mess after my 10 year old self got after that first shaggy little calf!