Watch the videos and read the PDF I linked above. Don't worry about crystals or any other 'aids' and 'enhancements'. They are distractions. The only exception I would suggest is perhaps lighting a stick of incense. I like vanilla.

My dad always told me to seek out the best, and I'll take the advice of a Tibetan monk with thirty or forty thousand hours of practice and the neuroscientist (Richie Davidson) who observed his practice using EEG & fMRI.