I agree it is infuriating. As I have moved around quite a lot, one of the things I always make up is a small book , which I give 2 or 3 pages to each room. Then as and when I decorate or do anything I make a note of how many rolls of wallpaper and curtain sizes etc. This is very helpful if you see something good in a charity shop or an end of run that would be worth getting. I also putat the back all the people we use, bakers plumbers etc., so that the new owners can at least start with someone if there is a problem.
So after a short time living somewhere, I will meet other women at the womens groups, people in the library or wherever and if they seem sensible people or on my wavelength, I ask them which person they use , especially if they are talking about just having a job done. I try and get opiions from perhaps 3 people and if they all say such and such is very good, or hopeless, tend to go on their advice. At the same time I do the same. With all the awful saga of the bathroom before christmas the plumber was excellent. Did what he said he would, came when he promised to , and was happy to give advice without pressurising me to go for a specific item. I have passed his name on to many people and as he has his own small firm, am pleased to pass work on to him and support a local tradesman.
I have seen this check a trade advert but prefer to do things my own way. It works out very well especially if you visit someone and really like something just done, you can see that it is your style. If I contact a tradesperson myself I am very clear. If someone has recommended them, I mention that. I tell them that I am very straight, and will pay them at the end of the job and not keep them waiting for ages, as some large companies tend to do. However I also warn them that I have no problem if they are unable to come for some reason, so long as they either phone or email m e and let me know. I am prepared to be as accommodating as possible and as I wake early, if they want they can come quite early. But I do not want to be messed about. So far I have done very well (fingers crossed) and I keep cards of anyone who has been very helpful, especially for things that you only need someone once in a while. So for any important job I would say look amongst your friends and acquaintances at any meeting you go to , church , wi, whist drive or whatever and if you introduce the subject you will usually get some advice worth listening to.