Somehow, I don't think it's physically possible to be *that* clumsy. Take it easy, take your time, it's not that complicated. After you do it a little bit, you may start to see that some of the hand operations are actually sort of self centering; when you push a little bit too much w/ one hand the other one gives a little bit, assuming you aren't trying to use a death-grip here. Some things work a bit better actually in my experience done by hand: chamfering the inside of the case mouth after trimming is one. I have the top-shelf Sinclair kit for my Wilson case trimmer, complete w/ Starrett micrometer, etc. When I started shooting VLD's I figured the best thing to get would obviously be a Wilson deburring tool (the one that inserts inside a Wilson trimmer in place of the normal cutter). Problem was I couldn't get an even chamfer for love nor money. Talked w/ one of the local guys that used to be a machinist at Wilson, and he said that was a pretty common complaint. The issue lies in that the true center of the cylinder where the cutter is may be a few ten thousandths off of the center of the case holder, which doesn't matter much for trimming, which is what the setup was originally designed for, but it won't give a consistent chamfer. Doing it by hand w/ a Lyman VLD chamfer tool... visibly better results, every time. Consistency is a touch-feel experience on this, to be sure, but easily mastered.
Try it!
Monte