Dont know about pessoa but I am currently using a bitless bridle (Easy Trek) which is the same as a Dr.Cookes. So far my horse has gone really well, in fact dare I say it, much better. Ok you notice the steering is not so precise so you have to use your seat and legs etc. and my canter at the moment is not so collected, although I can slow her down but I have only used is two or three times so far. She doesnt nose poke and halts square!! Sorry I cant be of any help with the pessoa but the Dr Cookes is really simple to put on, I think its fitted like a normal bridle with the cross under straps being the pressure points to aid control/pace etc. There is a more technical way to fit a bridle which you can find on their website. Perhaps see is pessoa have the same.