I'm posting this link, since I see so many people asking for help from psychic attacks, interactions with entities, etc. I've read over the PDF myself and it provides very basic, 101, easy to understand and perform techniques for protection, shielding, and cleansing. It's about 15 pages or so long, but it gives enough information to allow pretty much anyone to put these techniques into practice. I hope this is useful.
http://www.pathwayshealing.com/wp-conte ... Manual.pdf