I'd recommend Visual Guide to Lockpicking: 2nd Edition. Varjeal did a review on Steel Bolt Hacking, and from what I remember, it didn't seem to be that great. Let me see if I can bring up a link though.
viewtopic.php?t=3437&highlight=steel+bolt+hacking
Nevermind, Varjeal thought it was a mildly good read, especially for beginners.
Anyways, I heard a lot of good things about Visual Guide:2nd Edition; so....I guess I'm somewhat lost in giving you help.
But theres Varjeals review...so read that.
-Dave.
Never underestimate the half-diamond.