re: Hints, tips & secrets of plumbing - No Banter please!
Changing bottom inlet ball valves: Get the metal nut started on the plastic thread BEFORE you fully tighten the plastic securing nut. This gives you a bit more play and hopefully less headaches! Tighten metal nut fully once the plastic nut is tight.
Cust care: Even if house is a tip, but there's shoes at the door, take yours off too!
Tip: 90% of customers don't mind paying a bit more so long as your work area is spotless and you don't get re-called. There's no point being the cheapest all the time and cutting corners just to get by!