I have never had an official personal trainer, but my son have just got his certificate. I was surprised to hear, that you simply have to read a text book, take a test, and that is all. No on-site training required. You can get this certificate without every doing any exercise or seeing an exercise led by an experienced trainer.

So very often the trainee has much bigger experience than the trainer:-)))

I am sure others can help you with the price, etc.