It's an awesome feeling to get yourself up and over those rings. Muscle ups make me feel like I can fly. These are my absolute favorite thing to do at the gym. As much as I love them, I've struggled with how to explain how I do them. See, this is how I learned how to do a muscle up:
1. Watch videos online.
2. Buy some rings since the gym on base doesn't have them.
3. Try to get a muscle up.
4. Try again.
5. Try lots of times everytime I come to the gym. (Make music on my Nano loud to distract from all the people looking at me like they are going to call the cops soon if I don't stop.)