Wading into the flames... OP, doing your own fitting is not just an idea, but it eventually will be the outcome. Really, we all have to 'accept' or 'reject' the ideas and processes we come across or are pushed to.
To make the decisions which help you best, it's important to gain a strong self-awareness and attempt to be be unbiased in our application.
Yes, we are the only ones who can truly know ourselves, but that outside, very knowledgeable opinion and view is very important.
Depending.
If your goal is to reach the highest level possible, then the expert direction and opinion seems essential and proven time and again by world level athletes.
But there's real value in getting to know yourself. In the long view, over years and decades, the honest sel-evaluation builds on itself and just makes you more self-aware.
Fitting is a changeable thing. As you continue to dial in your fit, things are changing.
Self- fitting is the most interesting way to go. I'm all for it. Review everything, try a lot of different ideas, know yourself. And if you get the chance or desire to get some outside pro advise; if it makes the window, thru which you see your possibilities, wider, bigger; then that's all good.