Yeah, definitely a little scary, but they can be rented.
I rented one from Canadian Tire a couple of years back. You actually have to buy the compressor (around a hundred bucks IIRC), but they refund most (maybe even all?) of that when you return it.
Actually, I think Candian Tire "rents" quite a few tools like that. I guess the idea is that they'll make their money off of all the parts you are buying from them to install yourself.