I need to repot a small, living Christmas tree. I have repotted it
before and I had trouble keeping it upright and centered in the pot.
I need it to be upright and centered in the pot so that it will not
blow over when the wind blows.

Is there a trick for doing this? Thank you in advance for all
replies.
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When I am in the kitchen, I often kick one of my cat's balls.
After I kick it, he will sometimes play with it for a few
seconds to several minutes. His favorite are the ones that
rattle. He'll play with any ball that makes noise.