Try this post ! https://www.andersenwindows.com/support/window-door-installation/diy/
While you are at it, make sure that you don’t have any mold, any dry rot, any pests in the window cavity.
I would also make sure all of my flashing and my insulation around that opening is all 100% of what it should be.
Renewal by Andersen Windows, is a highly -accoladed product. You can trust it and it has a warranty.
Here is an easy video.. https://www.youtube.com/watch?v=rHVYqMRnr94
Hope it helps,
Is it just the glass that needs to be replaced, or is the entire glass, frame, and casing in need of replacing?