Not sure if you tree will end up holding fruit, but if you want it to, will have to wait obviously until after fruiting season. You can prune it now, as I was told by Bullie, as long as we don't got another crazy cold front to set off another crazy bloom (some trees with three blooms this year) you can prune the flowers off. Did you look up fairchild video by Dr Campbell? He gives a pretty good explanation. My understanding is prune it back as far as you want, just leave some leaves (LOL) at the end so the tree pushes nutrients to them. I pruned the hell out of my PPK last year, was very nerve racking, thought I did too much. She was pretty dormant until bloom season came and then all hell broke loose. Like Bullie said, depends on what you want to do, but on yours maybe just a good tipping?