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I've got bilstein coil overs and I've tuned them quite a bit. Easiest way to deal with the floating piston is put an air charge on it to move the piston all the way to the opposite side of the reservoir. Then releave the pressure and remove the valve in the schrader valve. Then add oil to the shock. Add enough that when you put the guide in oil comes out the relief hole. Usually I fill to the lower snap ring groove, you will make a mess but it's just part of it. When you put the valving stack in, you will want to work it up and down slowly, to disperse any air pockets. When you install the guide the oil will push the piston back in the reservoir. Doing it this way keeps you from having to take the reservoir apart and should make things consistent if you're trying to make sure everything is the same.
