The ability to touch up/cut down a lens with a hand edger is the skill I would say is most important. Frames can be so inexpensive today I think that's the way to go.
"Here's the spare pair with the old scratched lenses for $75. Now let's look at getting an appointment to check your eyes health and then make a new pair."
Again, I know I'm a bit of a burr under the saddle of the well rounded optician here but to repair today's frames is just not worth it.
If you still want to acquire the skill by all means do! But as others state you really need a mentor. Your local jeweler would probably know more than 98% of the optical world out there. In fact many of them do just that on the side.
Also I see more and more metal frames today being made from sheet stock stainless steel and titanium which are welded, not soldered.
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