You should use cut paste for those larger cuts, azalea are notorious to die back from big cuts. I bet it will be a very beautiful bonsai in a few years time.
My dad has some azaleas that have been planted at his house for 40+ yrs. If I wanted to dig a couple up and replant them for a bonsai what time of year would be best? I'm in the Houston area.
I recommend a carbon steel 6 or 7 inch concave cutter. Also a sharp pair of trimming scissors. I usually buy my tools from Stone Lantern when they have a sale. If you have a local bonsai club sometimes members will have used tools for cheap or will even donate to a newbie
Varies on type of tree material. I've grown ficus cuttings in cement trays and within 5 yrs have thick trunked well designed bonsai where as an azalea would probably take twice as long. The tree in the video had a nice trunk when purchased and unsure of how old.