I tried doing some research on this, as I have similar questions about my desert rose! Here's some of the things I've read:

• Keep moist and well fed during the growing season, and allow drying well between watering when dormant.
• The sap of this plant is very poisonous, so be careful and wash hands and tools well after handling!!!
• Trim longer stems after dormant season.
• When repotting, raise caudex to expose best characteristics.

Hope that helps!