main breaker will be OFF ....

plywood is rather expensive (I have 27 windows to cover), and if you have the time, a coat of exterior paint, especially on the edge can prolong its life... also helps prevent warping...for a lot of folks, storing the covering between seasons seems to be an excuse to not have any....my 18v Rigid cordless drill is one of my "must have" supplies...numbering just speeds installation ... hadn't though of someone stealing it, but they would have to have a #25 TorX bit..one of the carbines comes out of the gun safe

FWIW... I usually board up for a Cat 2 and 3, and will evacuate to a relative's house ( post Andrew building code) for > 3... the house has been 125mph sustained without problem...