Respectfully, I have two words for you, if you actually intend to do gun work: Baby steps.
If you're at the point where you need gunsmithing instructions, a "casual DIY kind of guy", it's not a good idea to jump right into advanced areas of gun work, where errors are potentially lethal - like stoning action or trigger parts, etc.
It's one thing, and sometimes pleasurable, to read about it - books give folks empowerment - but quite another to be able to actually do it correctly on your own, sans mentor.