Please get proper aerobatic instruction.
1. Get with an instructor that has the proper equipment. You must wear parachutes when other than solo.
2. Flying with an instructor in an aircraft suited for instruction is key. There's a lot more to flying aerobatics than the "gentleman's aerobatics" we do in RVs.
3. Learn what to do when things don't go as planned. Lots of great examples in previous posts. Hopefully nothing bad ever happens, but preparation is key.
4. Know what doing aerobatics can do to your RV. There's a couple Service Bulletins out there that have us check aileron hinge mounts and empenage mounts for abuse. Fixing these things can become expensive and time consuming, so know what you are getting into before doing lots of aerobatics in your RV.