Let us know how it goes bruce19; should be fun and hopefully enlightening too.
I've been road cycling (and some off-road) for 46 years now, and like you I've always thought I could set up my own bike, thank you.
And, as I was climbing up some of the 8,000 feet of elevation I rode yesterday (in 66 miles) I was thinking how good the bike felt fit-wise and since I haven't any neck issues like you have, I was thinking I still don't need a professional "fit."
On the other side of the coin (or $175.00) I am always open to learn something new, even if it means correcting something I didn't realize I was doing wrong. So, after all these years, and with all the advances in "fit-ment" I am now considering getting a "fit." Considering but not yet ready to go for it. And that's why I'll be awaiting your post-fit report!
Rick / OCRR