Some ppl just brush the rabbits (the best way) and use that fur, or you can shear them w/ a clipper, but because rabbits are small you need small dog or cat clippers w/ a surgical blade- which will clip to the skin...(which a good set will cost you $300-$400) you can't use the clippers for sheep, goats or your horse....
The best fiber rabbits are the angoras- The cream of the crop is the English angora which have mountains and mountains of fur that requires daily brushing, sometime twice daily....then there is the French angora, fuzzy w/ no head/ear fur, and the satin with shorter fur, giant angoras the weight about 10 #, that can look like a giant cotton balls, and german angora that looks like a smaller, Less fuzzy English angora.....all are a little different and require different care and grooming....the fuzzier the rabbit the more work it requires....