Pseudolithos flowers closeup

I killed several before I got this one, which I have had since June 2008. Something decided to munch on it this winter. so it is now scarred, but seems to be healing. I think benign neglect may be the key. After my greenhouse heater failed a couple of years ago, the temperature dropped to just about freezing before I discovered it wasn't working. Thought for sure I had lost it, but I guess they are somewhat hardy. It needs to be repotted, but I am afraid to tinker with it. Fingers crossed I will be able to do it successfully.