$.02 from a novice:
I would try to operate as much of the boat as is possible.
Through-hulls, wheels, rudder, levers, bilge pumps, anything that is supposed to move/turn on. Electronics, portlights. Hose down all of the windows and see if you get any leaks. Examine all of the lines for wear. The toilet - does it work, do all of the valves and through - hulls associated with the head, etc.. Sheaves, outhauls, halyards, winches, roller furler. Will you have to invest hours and hours in rebuilding stuff? Get that in the price you pay now.
Don't assume the surveyor will do all of this stuff. Put yourself in a place mentally to be patient during the survey. Take your time. Once the surveyor is done with his report, he's done, paid, and gone. Much better to find problems now than a month into your ownership. Spend an extra couple of hours during the survey and be a bit of a pain for everyone now.
Once the deal closes, you're on your own (save for the forum help, which is great but doesn't pay for parts or your time!)