Thank you :-) When most of us join Guinea Lynx, we think vets are people who can be trusted implicitly, that petstores will give good advice and sell products that are safe, and that guinea pigs are only small so probably won't be much fuss to look after. But it's not really like that! There are lots of good vets, of course, and the occasional good petstore (if it only sells products and not animals). And guinea pigs are really not that much fuss to look after, because they're so cute, they're worth it.
All I'm saying is, welcome to GL and thank you for being prepared to learn!