Hey Pau, welcome to the dark side! All I want to add here is jump in, brother! When you say focus is for champions, well, it's true, but we don't all have to be champions. Jaco has already lived, know what I mean? It's the journey, the new discoveries, that is the spice. I think renting a 3/4 and taking lessons immediately will answer 99% of your questions. Music, as you know, is only for the enthusiastically committed, and if the DB grabs you after a lesson or two, fantastic! If it doesn't, there are only about a million other instruments to try, and different things to do with your current electric. Let a teacher help you onto the path, then you'll know.
Enjoy!
p.s.: I don't think it will take you two years to be gig-ready.
This is a very liberating post. Taking 4 years to be gig ready while giving up all other musical instruments just isn't practical for me right now. I know that great things take commitment, but to know that I could at least get some good experiences out of it live in a reasonable time would be motivating.
In my work as a teacher, one thing I have learned to do is to simplifty concepts in the very beginning when people are new to the discipline to facilitate rapid early progress. People are not only learning the discipline, they are learning if a) they have any talent in the discipline and b) whether they LIKE the discipline and c) whether they think you are a good teacher.
So, a highly structured, well thought out approach to getting started that shows people they CAN show progress early and fast, is critical to helping people get that passion and engagement to tackle the hard stuff. After they have that, they can learn about the details and put in those hours. When it comes to improv, I have ways now of teaching people so they can improvise freely in a very short period of time over simple chord changes. I tested them out in two improv workshops I conducted at a local community center. No learning everything in 12 keys -- stick with C for a few lessons. Stick with the major scale only, and show them how it fits some simple II-V's. After they experience the joy of improv, we can then get serious about learning patterns in all keys etcera. The passion must come first as its necessary to create the motivation needed to master something.
I use that principle all the time in my work as a teacher. So, when I see that it's going to be four years in the woodshed, and when I see I already have a ton of gigs on electric and piccolo, with unexplored frontiers on those instruments, it makes me really sit down and count the cost.
The post above is encouraging.