We replaced 1977 leaky windows with Anderson replacement windows and did it ourselves. About 24 windows-ish (2016) cost was $300-ish per window. Took about 20 mins per window once we got the first one in and done (that one we took our sweet time). Banged it out over two weekends. What a difference too. Immediately Noticed noise reduction, energy efficiency and the view through non-acid rain stained windows was awesome. Good luck OP!