How the hell do I draw this?

[Jeanneillustrates]

I'm trying to study constructive form after years of just copying what I see and I am having a little trouble understanding this concept. Can I steal someone else's knowledge?

http://www.proko.com/robo-bean/
http://www.proko.com/robo-bean-step-by-step/
http://www.proko.com/figure-drawing-crit...robo-bean/

When I watch these three videos on making "the robo bean" I can understand the theory behind what is being taught but when I go to practice I am having problems with understanding the angles I need to draw the boxes at. I can't seem to see through the meat of the human figure.

I am drawing from poses on http://artists.pixelovely.com/practice-t...e-drawing/
I understand that it is tied to perspective, but..... I'm just basically drawing a blank.

Thanks for any help!