I've rode along with my farrier a few times, he does a lot of corrective work and I really like seeing the process and the thought that goes into it. I did turn him down once though when he asked if I'd go help to handle some...new owner with several mini jacks that had never been trimmed, yeah, no thanks!
It's never a bad idea to take advantage of an opportunity to learn more.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.