Re: Mauser question.
What type of safety? Is this an orginal military action, or a commercial action?
Just curious.
Anyway, if its a bolt shroud safety you just pull the bolt, rotate the shroud and pull the safety and install the new one. If you are not comfortable fitting the new safety have a smith do it. It pretty straight forward. Lots of instructions online.
If its a trigger safety, buy a new trigger.
And I'm not even sure how to respond to the last half of your question. Get your nomex undies on though.