Just knowing about this subject is enough to have one. I would be bet money, as would everyone else here, that you will at some point in the future will have a 3rd lucid dream. To make yourself confident, you need to take steps to prove to yourself that each thing you do, be it a technique or just thinking about it brings you closer to that next LD.

In a way, if you don't try, Ld's are just plain unavoidable. If you don't want to have one, then you won't. If you do want to have one, then you will.