I agree it is a skill set, but also a limited one. You cant gain heart surgeon control; you pretty much have what you have. What the knowledge is is knowing how to cheat your body to get it done. It is a bunch of micro movements and if you can put one aside a while, you can spend more time on the bigger problems. Them move down to the finesse. I have always found practice coupons go so far. At a certain point you have to start the work, and at the end you may want to go grind some welds out and do over. I find I weld better in the game than practice. Everybody is different and everybody has to do it their way to a certain extent, but if I have welded 30 clusters and only have a trash can of steel, I probably will not get it done. Either too hard on my self, or I need to be a pedestrian.