We had 2 windows that were caulked shut for the last 30 years or so. I just pulled up my receipt. It was $220 to repair the windows and another $160 for new screens. I researched DIY as well, but am glad I didn't. Apparently,it's common for our windows to not have access panels for the weights, so he had to cut out access panels. One of my sashes needed to be repaired as well.