We paid for the windows and installation, I couldn't have been happier. We purchased very energy effiecent windows, 32, plus 1 sliding glass door and 1 front door which included aluminum trim around the outside of all our windows and doors. We also replaced our siding and got new shutters at the same time. The cost as you can imagine for that required a 2nd mortgage, but the long term benefits have been super energy saving with the prices going up every year since then. Additionally they are guarenteed for life. We've had the company come out and replace a screen for free, the cats got to it -- no questions asked!!! The guy told us if our kids put a ball throught the window they would replace it -- free. (Long Fence and Home, incase someone was wondering)
Why I'm glad my dh didn't attempt to do it? He'd still be doing it!!! Our master bath has been under renovation since the last week in Aug last year, no toilet, no sink, just 2X4 walls studs and a new soaker tub for the longest time. He actually got the tile going up this past week.
He did replace a window with a door. It took 2 days to cut through the brick, then a few more to set the door, it still isn't finished. It functions, it just isn't finished off.
The price to pay someone to install the windows may be worth it in the long run. Is there a guarentee they will do the job right? Will they make good on their work? (You know, if it leaks around the frame kind of thing and causes damage before repairs are made).