These are Links that I believe you may find useful
© 2014 by PATRICK M MC CORMICK all rights reserved
Dr. Vernon Neppe has created many excellent videos about this reality of ours. I have listed one of my favorites.
I have used Marijuana in the past with some favorable results. It isn't really necessary but can allow an easy entry into a fully relaxed state. When you achieve proficiency entering a clear-minded state, it can easily be put aside.