Well, I've been practicing for some time now. I've been working on digital_blue's exercises. I'm now starting with four pins and using a pair of Defiant locks.
I find it interesting that sometimes it seems that I'll pick a pin and when I go to pick another pin the first pin falls back, yet after I pick the second pin and go back to that first one it will then stay. At first I would obsess over this, but come to just shrug it off and keep going.
I do tend to have trouble with longer pins. I can't seem to get a feel for those, so I've been forcing myself to practice more with those by mixing up the pins setting them in the lock at random with one of the longer pins.
I'm also starting to see how everyone keeps saying very little tension. I'm finding that as I get better I can feel more by using less tension to the point where sometimes I can feel a pin click as it sets.
It's pretty fun and interesting hobby.