Buying and selling a house is a complex affair where all these little legal obligations need to line up perfectly so that, even at the most basic level, at least everyone can move in and out of their current residences at the same and necessary times. Of course, there's a lot at stake, so it's a stressful time, and that's before you factor in that there are plenty of dishonest folk out there, both selling homes and otherwise involved in the process, which makes it essential to be on guard and n…