you can do most of the fitting yourself if you take the time. you'll do it much more efficiently if you can stand the bike up in a stationary trainer. use the videos in the link I posted above. set the cleats, then the saddle height, then the saddle for/aft, then set up the handlebar, shifters, etc.—in that order. it's not hard to find a stationary trainer locally on Craigslist or Facebook marketplace for cheap.

if your professional fitter tries to establish your saddle fore/aft by hanging a weight on a string from your knee, RUN. get out of there. that's some old wive's tale fitting technique called KOPS (knee over pedal spindle) and it's nonsense. it can be useful as a point of reference and can be used as a quick baseline fit, but it's not scientific. I've worked with a fitter who used that method and the fit was absolute trash. again, those videos in the link I posted above are helpful in dispelling the Myth of KOPS. Steve Hogg and a few others have gone into detail about this as well.