Drums and Bass

Thanks to all you guys for the warm welcome and the lack of drummer jokes!

Thanks so much for all your advice it is very much appreciated, I can see it's like anything else; There are sometimes no other alternatives but to get your head down and work like hell at it...All the best you guys.

Hello. So I'm a total novice on bass, my main instrument is drums although I have been playing in bands for 40yrs. I am 50yrs old and work in construction. ("so what? " I hear you say). Well, my question to the hive mind is about the one finger one fret method of playing. I am one day in so not sure you can get any newer and I'm having trouble not with finger weakness (strong hands) as such but being able to splay them out wide enough to play one finger one fret. Down the neck I understand that it is not really possible but otherwise?? Is this something that I will find gets easier the more practice I put in or is this something other more advanced players struggle with also? I have Parkinson's which doesn't help and my hands get pretty f*@cked up at work so hoping answer is that it will get better after day two lol... Thanks in advance.