This bit I disagree with.
Unless you're really careful. Or trying to change sear angles, A FINE file, wet'n'dry emery paper and an oil stone are all you need. Polish the sliding surfaces.
Changing spring characteristics CAN get dangerous if you don't understand how they work, but as suggested, take off a little at a time.
I think a lot of people think guns are voodoo (probably car engines, too) but they are just tools/machines, made by men, and operate on the same basic principals they have for hundreds of years. There really isn't anything difficult about working on them, it's all skills that can be learned. Take your time and remember it's usually easier taking metal off than putting it on.
Only caveat is to doubletriple check for safe function once you've modified it. I usually cock them, safety off, then use 'em for a couple of innings as a cricket bat to make sure they wont accidentally fire.
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