Thanks heaps for all the help! I'm pretty motivated to keep the rest alive for as long as I can.
The lithops died from overwatering, and I'm afraid the rest in that pot will too
Do they usually survive re-potting easily or?
Cacti and aloes usually do but, I don't know about lithops. It is important to remember that they are not cacti or aloes, they are something else. I am also new to the subject of lithops but, from what I have read on the internet, they have a growing season that is the complete opposite to that of cacti and aloes.
When re-potting, it is best to wait a few days between doing that and watering the plants. When watering in the growing season, apply water until it runs out the bottom of each pot. Watering a month should be enough.