You can possibly learn, but you must be willing to mess up to learn. I taught myself and have done many trigger jobs on box locks, sidelocks, rifles and pistols. Practice on a parts gun, so that when you mess up you won't be out anything. Don't make your first attempt on an important gun. Get a good quality optivisor, or other magnifier, and spend much time operating the lock parts in order to understand the operation. That's how you learn. Read all you can about it so that you learn the geometry and the relationships of the parts to each other. Get the right stones and files, and be patient. Go slow. Steel is much easier to remove than to replace. I may spend several hours on a trigger getting it like I want, or I may get it right in 30 minutes. They're all different.
SRH
