Hey, I did and wrote up my experience about it. I was in a similar spot to you where all of sudden riding a bike hurt a lot and i was trying new saddles, stems, etc. I researched around on finding fitters and came across some bike fit certification directory and Acme was the only place near me that didn't didn't double as a bike shop; I was trying to avoid certified bike shops because I didn't want to end up being told "hey buy a new bike" or "here buy $300 in parts". I just wanted someone to fit me on a bike.
This Gizmodo article w/ video also helped sell me on Acme
https://gizmodo.com/the-ocd-science-behind-a-perfect-fitting-bike-5924940
Onto the process:
First was an interview on what I'm looking for, what's bothering me, and what have I tried.
After that was getting on the bike to look at mechanics and then into a physio type exam: walk in a line, stand straight, get on a table to check hip movement, all that stuff. I ended up trying an orthodic and i liked them so I kept them.
Next was him putting my bike saddle onto GURU bike and setting it up based on my existing set up. From there it was trying different saddle options (this is SUPER easy there with the way they have the system set up, basically just a QR on/off) and they have a TON from Specialized, Brooks, Fabric, Selle SMP, Ergon, Fizik and maybe a few others. Obv they have their preferences based on customer experience (I went from Fabric to Ergon). Once a saddle is decided on they begin to adjust the fit through Guru by incrementally adjusting things: height, reach, fore/aft. My end result was a slight up tick in saddle height and a longer stem (I was on 80, needed 110).
Finally they set you up for retul and measure everything to asses it from a movement aspect. Since I had a slight hip turn (my right hip dips) I'm not perfectly balanced and thus when pedaling my feet are not even in length (likely the same as you), so my one knee tracks a little wonky. Again, all OK things by his measurement because it's a pretty common problem with a lot of enthusiast riders and he said he only knew of ONE rider to ever fully fix it; they basically stopped riding for an entire year and focused 100% on correcting it.
They'll email you a fit chart at the end with all your measurements which I then used to get my frame built.