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Scott, odds are oyu have a lightweight filler in the deck, if anything. I think a standard 1/4" portable drill shouldn't have any trouble--since you are starting with a brand new sharp hole saw. As long as you don't bear down hard on the drill, it will slowly eat its way through without any risk of burnout. It can be hard to see your centering mark past a saw that size, so if you start a pilot hole with a regular bit, that should also help ensure the big hole is in the right place.
Assuming the deck is cored--remember, you want to chew out some of the coring material around the hole, refill it with epoxy, and let that set up then redrill/sand as necessary for a good fit.