my cabling ends up a total mess
Good cable management means tidying up the mess as opposed to accepting the mess.
That’s work of course, but being good at something doesn’t mean working less. At best it means becoming more efficient so more gets done in the same amount of time.
In the average case being good is more work. Good luck.
[edit] The important thing about learning the piano is the expectation it will take time and dedication to a process of correcting poor results.
Sure you can hire a piano teacher. But you can also hire a consultant to come in once a week.
I did that for running cables inside computer builds and it gave me so many ideas.
Then... Buy a ton of zipties and such and try it. Then take it apart and do it better. I'm sure within 10 attempts you'll get pretty good at it.