I just bought a house and the upstairs hall and upstairs bathroom have nobin tube but the rest of the house is up-to-date can I update this myself and if so how if I shouldn't how much should this repair coast also I have a dimmer light in my dinning that's very loose and has a orange light that flashes inside it when I try to push the nob in to turn it off sometimes I have to push the nob 3 times should I buy a new 1 all around is that orange flickering light normal and when I meant loose I meant the nob to the dimmer VERY LOOSE

