up until now i've always removed and installed blades by hand with a socket wrench and block of wood. now i have a battery powered impact wrench. do you still put a block of wood in there to keep the blade from spinning or do you just unscrew the bolt without blocking the blade off? also when re-installing it what method do you use? before i would push the blade with my left hand while pushing the socket wrench in the other direction with my right hand. sorry if this seems like something everyone should already know but i've never owned an impact wrench until now. thanks for any help.