I confused here, I'm not quite sure what you mean. Why would I have to find a way to get 24vdc? If the garage opener operates off a 24vdc motor, isn't the power already there. I just need to drop it, right?
Well, 24VDC isn't exactly flowing out of the wall. You'd need something to produce it like a power supply.
The garage opener consists of the motor and everything else. That everything else (whatever it might be like the remote control electronics or other more delicate circuitry) would probably have something that converts 120VAC into a lower regulated DC voltage. You'd have to bypass this and reproduce the same type of regulator, except from 24VDC (not difficult).
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