Yes. All at once. Nowhere have I read or seen that it shouldn't be done like that...
I have done this one, in this process, I have some jade trees which I pruned about a month ago, and they are still in training pots. Their in the right conditions, but growth is slow.
Nobody has given me any advice as of yet on here? Just commented, unconstructively. Please give some advice, or don't bother. Everybody starts at some stage. If you're an aged bonsai gardener, and you're just not being constructive in your comments, please just stop commenting. It's not YOUR special gardening niche. It's an ART form, that requires lots of practice, research and failure. Being an artist and studied in art schools, I know that experimentation and failing is how you only progress.
So, constructive criticism please. Or don't bother.