The original windows seem to have a flange that has been nailed to the sheathing before the siding was put on. The house has aluminum siding and also brick veneer, and I don't want to damage either when tearing out the old windows.
The interior is drywall boxed in around the window openings with a sill made of a corian looking material. Damaging the drywall would be easy enough to fix, but I'd like to avoid that too.
I take on a lot of home repair projects and get good results, and I assume I have all the tools I need. I just need some direction here as to how to start.
One final question, and I suppose this is something all DIY people need to ask themselves at one time or another: Will there be any real savings buying windows from Home Depot and installing them myself vs ordering from one of the many local companies, who I assume get them bulk for better prices, and letting their crew install them?