When I fish rock bottom river like the Kalama ( canyon area) and others I frequently check my hooks for sharpness. I only use my hook file once depending on the hook then I change up. I only use Gami and Owners hooks. This can get expensive but I rather pay alittle more than have a chromer throw me off. How often do you guys change or do you. I know of some people who never change, I have seen people pick up hooks off the banks and use them