I would drain it after running it down to less than 1/4 tank, that way you don't have to worry about running out in the wrong place. After you get it drained as much as possible, disconnect everything and cap or plug all openings. After you get the tank removed take it outside and drain the rest into a container. Because it is difficult to get all of the gas fumes out of the tank I usually wash it out with soapy water. Stand it on end with the sending unit hole down so it will drain the water. Gas fumes are heavier than air, so any remaining fumes should also drain out. I would leave it outside for several days before bringing it into the garage. Leave the holes all open so that condensation isn't trapped in the tank.
Please be careful, all it takes is one little spark...