That's a lot to chew in one bite. I know that I was in the middle of a show when I started in on a 5er. I did take it to rehearsal one time and stumbled so badly that I would practice with it at home, but felt it unwise to use it in a performance. Not sure how you're learning those songs, but the nice thing about shows is the bass part is mostly written out. So the notes are right there and all I have to do is figure out which positions are most fluid. I hope you chose Popeyes. Yes, but no (if I'm understanding you correctly). I would have liked to have thought that I could identify strings tactically from 1 through 5 rather than 5 through 1 when I first picked up a 5er. In a way I tried it, mentally saying to myself "just ignore the low string and play it like a 4". But it didn't work that way. While some logic would make the 1st string as the tactile reference I don't believe it works that way for most. When I set my hand on a bass I'm not feeling for the 1st string to begin. On a 4 string my relaxed fingers go all the way across. And years of playing know where the strings are. On a 5er, the way my hand would lay would be no different and let me tell you how many times I had to grope for an A or a D string because they weren't where my fingers naturally expected them to be. And mentally, when we think of scales most of us begin by thinking of them in ascending fashion. Right? So when I begin to process the notes in my head I'm thinking of going up. But the strings and notes initially aren't where the fingers expect them to be naturally. And so if was for instance playing in the key of G, finding that C was sometimes tricky because I had to look as well as feel to make sure I was on the right string combination. So, while you're correct that from a tactile angle one would be pretty well off if they could orient themselves from the G to B. But from a human processing standpoint I believe that most of us would do it the other way naturally. For us, too do otherwise would be like trying to aim a pistol with your sub-dominant eye, requiring quite a bit of cerebral processing.