The factory trigger is easy to adjust but it's better for a good smith to do it.
The action bolt that you want to be cautious about tightening is the middle one. Just get it snug.
There are no standards that I'm aware of for tightening the two action bolts unless you have a HS Precision stock. IIRC, they recommend 65 INCH pounds. If it's anything else, I would get them a bit tighter than snug, but that's it.