Getting better at fruit tree pruning is a great idea. I have picked up bits here and there, but could certainly use more. I have thought that perhaps the best thing I could do is go to an orchard and ask to work there for a few days when they prune. It would likely be pretty low hourly rate, but if it is taken as an educational opportunity, that wouldn't be the worst late winter work. I would think they'd be glad to have somebody who understands trees helping. It is not like you will be competition for them down the road as they are not trying to prune individual trees. Hmmmm....something to think more about.
One thing I ask when somebody wants a fruit tree pruned "do you consider this an ornamental tree, or is fruit production more important?" Orchard trees aren't the prettiest things out there - you really have to open them up to get sunlight to all of the producing limbs if you want to maximize fruiting. I get about a 50/50 split on the answer...