Interesting topic slonezp ~
I too believe that with age comes experience. Being able to interpret what is experienced and than apply it effectively at a future time, date, different season & on a different body of water seems to come in pretty handy as well.
Something that I believe that everyone has is "Instinct". Each angler has at least some - but certain fisherman seem to be able to "listen" to it. Catching some fish can certainly help build some confidence which in turn may help an angler trust in him/herself (instincts). Perhaps this is an example of what "That Guy" does a little better than some.
"Seeing is believing" is a saying we often hear. Something that has served me well over the years is a spin off of this. (and not just for fishing) I really need to "Believe It - To See It." Having a positive picture in my minds eye of what I'm trying to accomplish and truly believing that the outcome is reasonable & attainable, keeps me focused and in the right frame of mind. Can self-doubt creep in when things don't exactly follow the plan ? Sure does, that's where self discipline comes in - only you can control your mind. So do it.
There are so many, many things that happen in a day that determine whether bass are caught, especially Big Bass. Some of these happen before the day of the trip and others are so far out of our control that there is no sense even addressing them. I like to try to be Balanced. It's very hard to be very good at everything - at least for me. So instead, I try to look at the big picture. I'm willing to spend time & energy ensuring I'm able to complete each fishing trip without struggling with Anything.
Consider how many evolutions there are on a standard bass fishing trip; trailering the boat, the launch & recovery, the boat handling itself, safe navigation, gear selection, ten different types of casts, casting accuracy, boat position, anchoring, hook sets, fish landing, net use, knot tying, bait rigging, don't spill the JJ's, using the electronics effectively, the list goes on. All of this could fall under the Ability category. However being super good at a few of these & not so good on others may end up being problematic. So, I like to work to be Balanced -
I'm definitely not That Guy, more like A Guy.
A-Jay