The door seals shouldn't be too bad, since taking out the windows isn't all that hard. The other windows I would go to an auto glass place, you don't want to mess up those seals. Or just go there and ask them how to do it. If the people are cool at the place they'll let you know how to do it. Tell them you would buy the seals from them or something so they'll get some cash out of the info they give you.