There wasn't much info on crafting in the first few hours of the update. I have no experience with WoW or anything, so they whole thing was new to me. I kept adding items until a blueprint popped up (class/slot token = 4 items). Then I realized you "find" blueprints by trying them in the craft box. I "found" the scrap metal blueprint after crafting 8 tokens. (32 items wasted) This bothered me on so many levels. I'm the type of person to be extra cautious, plan every craft, but I figured "why not just jump in and experiment, everyone else is doing it." Every fiber of my being feels retarded.
Never drink and craft.
EDIT:
TF2Items.com has a nice resource with images for the crafting blueprints. Just FYI.