I had the windshield of my Baron replaced recently, and it took two skilled
technicians the better part of four days to do all of the glass. (This was
all they do for a living).

It was an extremely difficult job, requiring drilling of rivets, fitting,
and sealing. I was glad to have paid for the job, since I didn't have to
worry about scratching or cracking the windshield. When done, the sealing
was perfect, with no leaks (water or air).

Good luck doing it on your own.