It's like many skilled manual jobs that, not technically difficult, but it looks simple with years of experience. Like we're fond of saying at work, 'you're not just paying for sweat, you're paying for what's up here.'
A year or two ago out toilet cistern cracked whilst I was at work. Mrs Stephec called one of these Speedy Plumbers type franchises, he disconnected the inlet and told her he could fit a new toilet if we bought our own. Labour was £180.00 + vat for a standard installation, extra if it was anything slightly out of the ordinary, so I told her to pay him his callout only.
When I fitted the new one the next day it didn't quite match the soil pipe because of a height difference, one quick trip round the corner to an old guy who has his own plumbing/DIY shop with a diagram sorted it.
Two and a half hours in total and £20.00 worth of bits was all it needed.