I've done this task, for me it took years. (That's Ok :} ) As far as training, I know that there are some varieties that are much easier than others. Maybe a list of some "Uprights" that are fast and woody? A list of your varietal successes would be fabulous! I would just add that when you begin the process it's nice to tie the "trunk(s)" tightly to the stake. That keeps it REALLY straight. Later on, once the head has begun, I loosen the tape a bit, a larger stake now but a bit more mobility. Watch out for any wind. They snap easily in wind. Thank you John, Good info!