Word of mouth works great - but you need to pay attention to whose mouth you are listening to. If someone can't, for example, determine on their own if their dog has fleas (sorry; no offense meant) and needs to take the dog to the vet for that determination, I'm not sure I would consider their opinion as qualified. You really need to find a few knowledgeable people. As someone mentioned earlier in the thread, a vet tech from an animal hospital (if you can get so lucky.)
There's a vet near me who *still* insists that if he gives a cat a feline leukemia shot, that the cat can't develop it down the road. The truth is, if the cat has already been exposed, it's generally too late for the shot. That vet is always busy, has a lot of customers, but the customers don't realize that the vet has done nothing to maintain his knowledge (in the words of the vet tech at the regional animal hospital where we were educated about feline leukemia and where they diagnosed our cat that the local vet couldn't figure out what was wrong with for several days.) Basically, that vet is perfectly qualified to neuter or spay an animal, give annual shots, check their gums, and maybe a few other routine things. Anything else... you're better off somewhere else.
Our current vet - that guy is a walking encyclopedia of knowledge. He never ceases to amaze me. When we got fainting goats, we were the first in the area. He came out for something routine - shots or something. The next time he came out, it was obvious he had done his homework and knew as much as anyone out there about that particular breed.