Yes - work with your trainer and make sure you aren't rushing into it. A correct Piaffe takes years and years of dressage training. If you're at that stage of training, working with your trainer is going to be more helpful than getting advice online - very few people know how to ask for Piaffe, let alone train it. Having said that, you've already gotten a reply from one of the few on this board that would be able to offer advice in training a (correct) Piaffe.
You can get your horse to mince it's steps in what I call a "parelli-itis piaffe" fairly easily, but it is very incorrect. Posted via Mobile Device