This one definitely deserves its own thread! Love the work Arthur Joura did on this American elm, its so typical of the Oak trees we see here in the forests and parks. some of you may remember his posts from the old IBC forum, he does great work making trees look like real trees.
Last year, I documented the first repotting of my Abies lasiocarpa into a bonsai pot. These are the techniques I have learned for stabilizing the tree and maintaining the correct planting angle.
Have plenty of different sized props on hand to hold the tree in the desired position: