You can do your own oil changes if you've got the time and tools. If not that, I'd find a local mechanic that you trust and get all your work done there.

Chain quick oil places usually get things right. But they don't have the tools or skills to fix things if they mess something up. They also tend to employ bottom of the barrel people who tend to not care about their work.

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.