Scaling the Posteriors: Misson Impossible

I cant do it! For some reason, nothing about scaling the posteriors makes sense to me! The blade angle does not make sense, or the doorknob motion with my wrist, nothin! I am going to have to do some serious practice on my typodant for this one and hopefully a light bulb will turn on...i thought the anteriors were just dandy so lets hope i was doing that right last time! I am excited because we are at midterm in the semester meaning that pretty much the rest of the semester, we are just practicing what we have learned this far and adding on a few more, simpler skills! Time is flying by!!!!!