I've fitted halogen downlighters to most rooms upstairs, which is usually relatively easy despite climbing around the loft like a chimp. I'd like to fit a set downstairs but I've then got to tackle the chipboard problem! I just wondered how the pros do it, I'm almost tempted ripping the plasterboard ceiling off in places and getting a plasterer to replace afterwards. I've taken chipboard off before but as it's tongue and grooved and nailed I always find it near impossible to get them up with out wrecking. Why don't they screw them down instead of nailing when the house is built?