Sooooo....the bottom picture would be me LIGHTLY scraping the rough part of the nub on a part down. I find that it saves sanding time if you lightly use your knife to get the bulk of the rough nub off. But you have to be careful because if you use a lot of pressure you are either going to get your finger when the knife gives way with a release of pressure or you are going to gouge out a nice dent in your plastic part and that's just a pain in the butt to fix. So I use light pressure to shave off a bit of the roughness of the nub left from the tray. The way I think about it is like shaving the piece as if you were shaving your leg or your face. Light pressure and let the blade do it's job. You would want to put a lot of pressure on the razor while shaving your leg or face because you are just gonna injure yourself. So light pressure and you won't injure the piece. :-)
The top picture would be the first sand paper out of the before mentioned 54321 series of sand papers I use to get a nice smooth nub free surface. I just take my time sanding and making sure that I am not over sanding and creating a weird spot on the piece. Can't be too careful with this model! I wanna make it PERFECT!!!!!! haha.
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