We have finished basements in two of our houses and we did on a weekly basis. It took awhile but at least it didn't hurt the pocket book so bad. We decided how much of my income we could spare - two children's worth and then every week we used that money to buy supplies and the week to install them. The walls were framed 10 feet at a time sort of thing, a bag of insulation at a time, that sort of thing but it was also fun to watch it come together.