Buying or selling a house is a pretty stressful experience, there's a lot on the line and a whole lot of things need to line up for everything to fall into place. Plus, there's plenty of opportunities for someone to screw you over from the realtor to the seller/buyer themselves, so it's pretty easy to be on edge and understandable, at least, to want to control every aspect of the situation. Still, as with anything in life and especially in stressful situations and negotiations, approaching thin…