I read frequently, that people did that job here, and all went fine, except that they broke a few plastic hoses... well, that's a problem, because, if you find those hoses at all, they are prohibitively expensive. I live in a warm climate - nevertheless before touching a plastic-hose-connector (it's a squeeze to open mechanism) I always apply a little bit of heat with my heat gun, because old plastic is brittle, but if it is warm, it is less brittle.