It took me a while to figure out exactly where to bind off. My tendency is to do it at the end of the row. After all, since binding off usually means "you're done," it should come at the end, right? However, that means the working yarn is left stranded after the bound off edge, and you can no longer work with it. I then have to cut the yarn and reattach it at the right place so I can keep knitting. This messed-up method works, of course, but it also means more ends to weave in, which equals more headaches.
So, mental note to self: bind off first; then keep knitting 'cause sometimes "bind off" doesn't really mean "you're done."