You ARE out in the boondocks, aren't you?
You may not like my advice, but if I were you, the first thing I'd do is see what kind of vet care is available before I got GPs in your town. Small animal (dog and cat) vets are not trained in the care of exotics, and some of them are downright dangerous. Even exotic vets don't always know how to treat dental issues in guinea pigs. If there are no exotic vets available to you, I think you should pick another pet that a small animal vet can care for. That probably means a dog or a cat. I know pigs are cute, and I love mine to bits, but vet care is expensive, and even in Houston, the 4th largest city in the country, there are only a handful of exotic vets. And they're all expensive.
Guinea pig are prey animals, and as such, any symptoms of illness they have are hard to detect. They can go from well to dead in 24 hours from a respiratory infection, and in less time than that from bloat. Some things you could treat yourself, but URIs, bloat, and dental issues require a professional. It would be very hard to see your guinea pig die because there's no one available who can treat it.
Maybe you can put GPs on your list of "must have" pets when you live someplace a little more urban, and with an exotic vet for pet care.