I'm quoting something I posted in another thread:

Judging from my own experience and what I've read in this forum and elsewhere, having intentional LDs is part desire, part sustained application of one or more of any number of techniques, and part luck.

I think Castaneda's method of trying to find your hands in a dream is as good as any, but probably no better. It does have the virtue of being simple; you will always have hands to find in your dreams.