Help with Enochian magic?

I made my first attempt at scrying the 30th Aethyr last night and, while it is interesting to note that I could feel my eyelids twitching as if I were entering REM sleep, I was too caught up in expecting something to keep my mind still and only vague sensations and pseudo-images were forming. Is anyone more experienced? Are there tips/techniques/experiences you would be willing to spare? Any helpful books? Thank you!