I am replacing a wood window that was build in the early 1900's. The original installation was really odd, it was mounted in place by the trim boards. Two nails on the outside of the trim into a stud and two nails into the wood window frame were all that held it in place. I ordered a replacement window but before I install it I need to cover and seal the 2x4's that are in place, right? I am thinking I need to put some flashing over the studs and then put some 1x6 around the perimeter of the window, then install from there. Am I on the right path with this? I am fairly handy but this was my first window replacement so the installation curve ball is throwing me off.
I found the link below about a guy that has done this before but it seemed a bit confusing.