It's kind of nuts. I'm 6'2 and 18 years old and it feels like i'm going through puberty again. I've been getting around 12 hours of sleep a night because I just can't function otherwise. I have to stretch my legs all the time because they're not used to carrying around this weight.
I'm only half way through ABBH I, too, and I can't wait until I can get on a strength based program.