Not all trainers are created equal. Methods and teaching abilities vary widely. You’ll want to have a good gut level feeling about the trainer you choose. Don’t just look for the cheapest, or the most expensive. Don’t fall for lots of jargon and don’t expect a magic wand. Get plain talk about methods. Ask the person some sample questions about how they would plan to address some of the behaviors you need help with. Also ask about what they consider a basic training program. Does it include how to apply commands to practical everyday situations? What professional organizations does the trainer belong to and do they have any certifications? The field of certifications in dog training is relatively new, so many of the older trainers may not have a certification yet have years more experience than newly certified people. The big question is whether their methods are humane and whether they keep up with advances in the field as any good professional should. All that said, you need a trainer who likes and respects you and your dog. After all, if you’re going to engage in a learning curve, you should make it pleasant and rewarding for you as well as your dog.