When you try a bitless bridle - any of them - try it out from the ground first. Work on light responses and suppleness, and be sure to fit it right on your horse - although "bitless" seems kinder than having to be harsh with a bit, it can actually be very hard on many sensitive points on the horses' head, and especially, when poorly fitted. Just a few days ago I observed a sensitive horse panic when he got put on a hackamore for the first time, the rider hopped on right away and didn't pay attention that the nosepiece was actually too low. That hurt the horse and he went on a bucking spree not long after, refusing to move forwards. As soon as the hackamore was put on properly, he relaxed instantly.
When all seems good from the ground, start riding, but at first make sure your aids are light and the horse feels right with it in the arena, and only then hit the trails - a good idea would be to stick with slow work and small groups for the first few rides, until you are fully confident of the horses' responsiveness.
I have come a long way, to surrender my shadow to the shadow of my horse.