Well, it never hurts to be informed, even if you don't intend to pursue a career in shoeing/trimming!
If you want to learn for the sake of knowing or to really benefit your horse's overall health, then go for it. I don't ever recommend someone picking up nippers "just to save some money" on their own horses. But you sound like you are wanting to do it for the right reasons, and knowing that you are just wanting to 'tweak" between farrier visits, I would say start with reading anything and everything you can. Yes, even classic farrier texts are helpful in getting you to understand what you are learning about barefoot.
Good books to start with are: The Natural Horse by Jamie Jackson, The Horse Owners Guide to Natural Hoof Care by Jamie Jackson, and Making Natural Hoof Care Work for You by Pete Ramey.
For all that, you'll probably find that once your horses is adjusted to being barefoot, there's not much need to touch up anything between visits (if it's a "natural" trim instead of a pasture trim---pasture trims are a little different and tend to let the walls start to chip sooner). In fact, most of my clients I have to to remind that it's about time to trim because they don't see the chipping/flaring that they did with pasture trims so think they don't appear to need a trim. But the key is prevention, so maintain that 6-8 week schedule anyways.
Some horses just out of shoes do take some time to quit chipping and benefit from 4-6 week intervals at first. The nail holes from the shoes will have weakened the walls so they chip as they grow out, but as healthier wall grows out, this will stop. If your horse has thinner walls (TB's and appendix QH tend to have thinner walls) they will chip sooner than thick walled horses. usually it's only cosmetic and really there's not much to rasp off once it's broken off. In fact, over thinning by rasping could make it worse, so your trimmer should be consulted before working them over.
Glad to hear you are trying barefoot. It's sastisfying on many levels!
Barefoot and Loving it!
http://www.barefoothooves.net
