I use a sharp drywall saw. I have the one that folds up and uses sawsall blades. I bend the tip slightly. That way when I'm crancking out those circles my blade does not slip out on the down stroke and nick the cieling on the up stroke. That happens to me after cutting a lot of holes especially if I'm reaching out far. They don't make as much dust as a power tool. With a box undernieth the mess is not too bad.
Someone gave me a Greenlee adjustable hole cutter for Christmas but it broke before the 1st hole was done.
I seen the hole saws go out of control on the drywall before so I don't want to practice on the customers homes.
A roto zip with a circle cutter might work nice. I don't have the skill to use one free hand.
Tom
