A minor first for me today – rather than call a plumber, read up on sweat joints, went out and bought a torch and a flux/solder kit, and installed my own fittings on 1/2″ copper. Not beautiful, but amazingly, all three joints (two sink + one toilet) came out watertight on the first try. Once brief elation had passed, discovered that the sink we picked out for this already very small area was 1″ too wide, so we have to take it back and get a tiny one – a wee hand-washing basin. S’okay – we’ll do something less frowsy looking this time, so it’ll work out for the best.