Just use a quick mend if you want. Setting the hook in fly fishing for trout is really not necessary. Just put a little tension on the line is all it takes. The motion the trout uses taking the fly will naturally hook the fish. We use small sharp hooks, a trouts mouth is soft and easily hooked with these small sharp hooks, it doesn't take much force to catch the soft skin with these hooks. Fishing for bass is another story, you are trying to drive a large hook into a bony mouth and it requires more force.