I bought a Yamaha 415 last year, 1 to try a 5 string , and 2 to try a Yamaha, and for me the notes were the easy part because I know my fretboard, but at first I regularly hit the wrong string, especially if the Bassline involved quite a bit of string crossing , it took a lot of practice to rectify it . Imo, the best thing to do would be to put the 4 away and just use the 5 until you’re happy with your playing, and then you can switch between them whenever you want 🙂