It's extremely easy to replace stock on a remington 700 of any flavor as long as you go back with exactly same configuration. The main thing IF you're concerned with optimum accuracy tho is to glass and/or pillar bed it. As far as fitting an aftermarket trigger,why not get your local gunsmith to rework the existing factory trigger? They can be tuned to be mighty sweet utilizing only factory parts and maybe a spring kit. As for installing a new trigger yourself,I would HIGHLY reccomend you get a gunsmith to do it UNLESS you have very good understanding of the dimensions/angles/measurements so that it'll be SAFELY installed/fitted/adjusted to your optimum pull weight,overtravel,takeup,and amount of engagement. It's something that a couple thousands of an inch can mean the difference between a dream trigger and an unsafe nightmare. Many people have installed triggers themselves so if you do decide to install it yourself,read all the instructions THOROUGHLY before even starting work on it.