I might (as in maybe) be able to change out the thermocouple if that video is any indication.
Anything else involved and I'd be over my head. I'll head to the hardware store and pick one up, if they are all pretty much the same. If I have to get a specific one, I'll be lost.
And then I'll try to get my brother-in-law to stop by. He's the one that installed the water heater for me. I bought it from Lowe's, and their delivery people said they weren't allowed to install it, since it was a gas one. So my bro-in-law did it for me. Heck, the house he and my sister just sold, he built
everything himself, except for pouring the concrete for the basement. He knows what he's doing