The best orgasms I've had on solo ventures are when I have a lot of privacy, no concern for inturruptions (Just like with a partner!) and I create a somewhat elaborate mood. Like Lucy said, denying myself for a long time is key. But the most important thing is to be self-observant, and self-directing. I generally have internal verbal thoughts, which are commands and exciting little abuses, and then I respond physically and emotionally in my submissive way. So, more or less, splitting my personality in two.

Have fun!