1987 Nissan Maxima removing thermostat on 1987 Nissan maxim

What tools do I need to remove the 3 bolts to replace the thermostat. There is very little room to put a tool especially for the inside bolt. I need to know what to use to remove the bolt. It has to be able to get onto the bolt and over the metal flared pipe which attaches to the rubber radiator hose. How long does it have to be to get some leverage Do I need some kind of seal when I replace the old themostat with another one? Since all the water seems to have evaporated from the engine block do I need to do something prior to trying to start the car?