I'd get Matt Burkett's videos RIGHT NOW, lessons 1-4.
Enos' book is good, but the title says it all--"Beyond Fundamentals". You ain't there yet, and it's going to read like a bad episode of "Kung Fu" until you hit middle "B" Class. You absolutely have to have experienced psychetracche before it makes any sense (the apparent slowing of time). Until that point, it's just a bunch of zen crap. After that, it makes perfect sense and you recognize him as a genius (seriously).
Andy Staffor'd "Surgical Speed Shooting" will backup Burkett's videos nicely.
Burkett's videos are invaluable, and I will second Saul Kirsch' book.
Dan