Even if you think you have everything under control, it always pays to go over it one more time. That goes double if you're dealing with anything legal or financial: it's absolutely imperative that you get a professional opinion or have some way of making sure that everything is on the up-and-up. You may encounter some very unusual minor details, and if you don't ask questions before signing the paperwork, you could lose a lot of money, waste a lot of time: or both. It's so much better to be safe than sorry.