My only advice to anyone interested in advanced memory techniques is this:
Use them, don't just learn about them.
I spent way too much time learning all the tricks, assuring a perfect understanding before I dared jump into using them. But once I took the plunge I realized two things: (1) The only real way to learn memory techniques is to try them out, and (2) you can't really mess it up, there's no permanent damage from doing things the "wrong" way.
So spend 10 minutes reading about one or two techniques. Then spend the next couple months using them. Next, go back and refine your practice.
I use these techniques for college. I'm a math/physics major so they don't help too much, but once in a while I take an art history course or something where there is a ridiculous amount of material to be memorized. But memory techniques seriously make you feel like you're cheating, they're that good.