Everyone is different but I've lived here ten years and when I wanted a plumber, electrician, roofer etc. I asked neighbours and work colleagues.
And I'd ask 'do you know a good, plumber? etc etc I didn't ask do you know a cheap plumber? In fact, quite often someone would say, he's not the cheapest but we've used him for years. That gave me reassurance and I was happy to pay what they were charging.