I actually learn on five string and never use for string officially .
My first bass was(is) Yamaha bb 415 .
The neck looks like a jazz neck a little wider but same profile and the curves sit well under my fingers.
I can't play p bass it's so annoying for me because neck is fat for me .
Any time you learn a new skill set, things will feel different and forced. I played all types of four string basses for years before I bought a fender jazz five string. I had but played one in a store before that. I knew I needed the flexibility they offer so I dove in, figuring the Jazz would have the most user friendly neck. Another thought was the string spacing. Instead of the strings close together, the spacing was closer to four string basses on the jazz, and something I figured would help me.
I made a mental note to put up my four string basses and not touch them until I became comfortable with the five string. And I stuck to it.
At first it was completely frustrating. I felt like a novice picking up a bass in their first year of study. My fingers couldn't find the right strings, let alone the right notes. I don't know how many times I put the bass down in disgust after trying to figure it out. I had 20 plus years under my belt playing four string basses at the time. Playing was like breathing.. I didn't have to even think about it. Now I could bearly play a song. Everything was a struggle, and I had to go slow and think about every move I made. I was completely frustrated. But I didn't give up, and refused to pick up my four string.
Guess what? After about three months I started getting the hang of it, and I started experiencing the fretboard in an exciting and new way. I learned the muting technique I needed to play cleanly, and I had more notes under my fingers at all times. Horn keys (b flat, e flat, etc) were no longer a struggle to play, and walking bass lines became more fluid. The big, bulky five string neck seemed to shrink and become more manageable every practice session. Using the b string as a thumbrest, I could explore all sorts of different playing positions all over the plucking area I couldn't with the four string. My musical world had just become a lot bigger.....
When playing four string basses, a precision neck seemed huge, almost too big. But after getting a good feel for the five string neck, the four string models felt small, to include the Precision. Through learning different right and left hand technique, I became a better four string player as well.
These days I go between a four string and five string bass effortlessly, with neither feeling foreign to me. This did not happen overnight.
Be patient, and stick to the five string bass until it feels as comfortable as your four string. I suggest putting the four string up until you get to they point. It's too easy to go back and not finish the learning process.
All the necks will feel huge at first, but with time your fretting hand will adapt and learn to maneuver the fretboard. Once you get comfortable, you will find what fits you the best.
Personally, I like the wider but flatter necks on a five string as opposed to the narrower, thicker necks. Regardless, if played long enough, your hands will adapt to whichever bass you are playing.
I hope this motivates you into learning and unlocking the five string bass. It truly is so much more than just five extra low notes.
Good luck with your musical travels my friend.
