So on this stage of the project, I went into this knowing nothing. Absolutely nothing about window trim, or jamb extensions. So I watched a bunch of youtube videos and read a bunch of articles. This video in particular was the key to my success. And the Guy totally looks like Brett Favre.
So, in two hours I measured, cut, built and installed the jamb extensions. These are needed because my walls are 2×6″ construction and they installed vinyl windows which are like 2 inches wide. So one must do something with that space. I chose paint grade pine for this job because it was affordable, and if I made a mistake I was out like $5 for a new board. I am super happy with the way they came out considering I had no clue what I was doing when I started.
Tomorrow I will finish the other two while the Wife primes them for paint.