Since I had two trees, I made a scene. It is a pain to do, but I have fun with the challenge. I recently changed it to add a wreath (it took me this long to get doubles of the ribbons).
I had to dress each, then go to a "bump" message in my trade thread and put them in and hit preview to see how they lined up, then tweak the items until they lined up. MUCH TIME.
Seen together: