Well my little tree has stopped dropping leaves and is actually turning out quite lovely--- thick, lush, shiny green leaves, and buds that seem to appear and grow overnight!

Needless to say I'm quite pleased with myself for having maintained it thus far-- I was really nervous and afraid that I wouldn't be able to keep it alive.
The other day I noticed while watering it that it's starting to "push up" in its pot, with the top part of the roots starting to come through the soil, and it seems to be getting thirstier more often. My reading tells me this means its time to un-pot, but I'm hesitant because I understand this is a rather stressful thing to do to the tree and I don't want to hurt it while it's budding . . . also I'm scared of damaging the roots because I've never done anything like that before and I Really Do Love this little tree
It seems like it's wanting to be unpotted fairly soon. If that's the case, what sort of soil mix would you personally recommend? I'm a bit overwhelmed by the different elements and combinations out there, and I don't think I'm ready yet to venture into the science of mixing my own, so I will probably make an outing to the local nursery and take a look at what's available.
Thanks so much for all of your help, your input has given me much sureness in this new venture!
Bunny M.