I think the problem is that online tutorials can't show you what a teeny tiny bit of now missing material will cause parts not to catch each other correctly. Again, there's no undo button on that. This goes double for the fact that they're all somewhat unique.
If you want to do it yourself (I'm also all about hands on learning but I had the benefit of experienced friends looking over my shoulder) there are some precautions you can take.
First, this shouldn't be your only trigger set. Have some backup components and maybe even a set in your range bag you'll never modify so you'll have a properly and legally working gun. Always err on the side of safety. When it gets "pretty good" think seriously about stopping. If you can get a hold of a finished rifle or someone with that kind of experience so you can get a comparison that would be good.
When you're test firing is the time to really be careful. Do all the normal checks after re-assembling the rifle such as safety and dry fire. Start out with only one round at a time. Make sure the rifle resets correctly and all that. Then do ONLY TWO rounds. Make sure it's not going to double. Then three or four rounds to make sure it won't go full auto. Do each a few times to be sure. When you build up to a full mag (and I'm not saying go one at a time) remember that the mag release is the ultimate abort button if something goes wrong.
I think that covers the basics and I'm sure someone else will chime in if I forgot something important.



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