Don't go to a dealer. It will be more expensive. That being said, you don't really need many tools to do an oil change except a ratchet - which most people already have if they're handy at all, and an oil filter wrench - I got mine for like $5 at an auto parts store. Wait for a sale on a bulk amount of oil that fits your car and just keep it in the garage or elsewhere.
I'm not super handy, but I've generally been able to save $10-$20 on each change over the years when I still drove. Plus the time component once you get the hang of it. I could change mine in about 20 minutes in my driveway.