(fretless player here ) i respectfully disagree: while both instruments require your 'ear', the muscle memory issues, previously mentioned, may require some attention (brain training). there is no 'easy' way: two different instruments, generally for two different purposes: learn bass = suck it up. have fun in either case.you will pick up bass in no time and be better than 90% of us here in no time.
learning different instruments to accomplish musical goals = fun, hardship, frustration, fun, frustration, fun....that's why we practice!A few years ago, I started playing in an Alt Country/Americana type band (still do). I decided to pick up mandolin - for the band, and just for my own amusement. It was very challenging to move from bass to such a small sized instrument (also tuned in 5ths), tiny doubled strings and picked rather than finger style. Now, I am not going to give Chris Thile or David Grisman any worries, but after a year or so, I could definitely hang in there on a gig just fine. I also think it helped my bass playing out too, as it made me rethink some things as far as my ear, and left and right hand techniques. I know I definitely became a better pick player on bass (traditionally I have been primarily a fingerstyle player).
^ this! it's this!the whole ethos of the instrument and the role it plays is different
^ this! if you're going to be a bassist (even part time for shitz and giggles) then you have to commit to the bass part of 'bassist'.Learn to play in standard tuning, as everyone says
speak for yourself! not reading music has nothing to do with the OP's stated issues (as i understand them).The fact that you can already read music gives you an advantage over anybody who started on electric bass
OP: do yourself a favor: if you want to be a bassist: learn bass! if anything transfers from cello --- lucky you --- but, take nothing for granted. they are not the same, no matter any similarities.
i agree with all posters who advise having fun! life is too short.