Is it possible to remove an ear tag from a guinea pig's ear without a veterinarian's help?
Guinea Lynx member Feylin wrote some helpful advice on this thread about how to determine if you can remove an ear tag by yourself:
"Look at the place where the tag is in the flesh of the ear. If you just see metal tabs, you can remove it yourself with no tools needed. If you see hooks or latches of any kind- you need the vet and tools."
More advice and experiences can be found on these threads: