To return to the OP's question, I started out in the very early 80's with a couple of street girls in Argyll Sq (I think?) and then graduated to phoning numbers from cards in newsagents' windows. Completely blind, but some good results - I remember a very good French flat in Orange St, near the National Gallery. Lots of girls round Gloucester Terrace and Paddington.
Later I started to work in Soho, which continued for nearly 20 years, so the walk-ups became my punting domain. Again pretty much blind until you got to know some of the regular girls but very high turnover. Some surprisingly good girls worked in the walk-ups, but they were a bit grim and not at all discreet. Sitting waiting in the kitchen for the girl could be a dispiriting experience.......
A bit later, Les Girls and Soho Cottage came on the scene with a regular rota of girls, so that if you saw a girl you liked, she would be there on set days of the week. Well-run places in their day, and a pity they couldn't survive. The best girls in those establishments, such as Paige at Les Girls, were the best available in those days.
Of course it was different - only OW and absolutely no kissing. The only uncovered oral regularly available back then in Soho or Shepherd Market was at the French flats in Dean St, close to Soho Sq - Lily and Josette. Anal was as rare as rocking horse shit - Jackie, first of Lisle St, then Peter St, last seen in Shepherd Market was a pioneer of that dark art, and very good too.
AW did change everything and PN at one point was excellent, but obviously both have deteriorated (esp PN) to the point where they are getting on for fucked-up useless. AW now is ONLY of any use a locator, IF you have a good bullshit detector and time. Plus the excellent resources of this site.