Just updating for posterity's sake - the long and short of it is that I installed all of the parts, took a little longer than expected but overall it was fine. I'd rate the difficulty for a novice like myself, on a scale of 1-5, about a 2.5
I used the S-2 upgrade kit with reach reduction - parts # 75820 installed in a Shadow 2 optics ready
Some general tips / tricks that I found useful:
Buy the starter punch or else you'll be fighting the hammer pins more than necessary
Have red & blue locktite on hand
Have acetone (and q-tips) on hand to degrease the set screws and the various parts that you're taking out of your gun
Have a needle nose plier to install the trigger return spring and the sear spring
I don't think there is any youtube video or guide out there that covers what to do with the sear spacer that comes with the kit but it's pretty straight forward and self explanatory... it goes in the sear pack right next to the adjustable sear, held by the sear pin. I used a punch like a slave pin to hold everything together
Overall, it took about 2.5hrs from start to finish, including time to completely strip the gun, clean / degrease every part (a lot of time spent on using a toothbrush to get all the dead skin out of the lok brass grips), reassemble, and tune the sear & trigger set screws. If you're more experienced than me, you can probably fly through it much faster.