This trick is typically a good choice to teach a guinea pig new to trick training, as it is usually pretty straightforward to teach. It often takes a bit more repetition than some other tricks though, so be patient when teaching it. It might take several short (3-5 minute) training sessions for a guinea pig to completely master this trick. Some piggies have a tendency to put both paws up on your hand instead of just one, but if you are consistent about rewarding for one paw only, the guinea pig should catch on pretty quickly.
For written steps and more training tips for this trick, check out the Give a Paw trick tutorial page.