Free advice:

If you have a horse that has behavior problems and you are looking for someone to help you, please understand that you are responsible for insuring that any rehabilitation training that takes place needs to be transferred to you (the owner).  You must be ready to take the time and put forth the effort to continue your horse's training.  So listen carefully to the trainer and learn how that trainer worked with your horse because if you don't your horse will revert back to his/her old habits.