How to play jazz upright bass

1. How hard is it to play upright bass?
2. Is jazz bass hard to learn?

How hard is it to play upright bass?

Playing the upright is difficult. It's a physically demanding instrument that takes a long time to work your body, arms, and fingers into being able to play efficiently enough to avoid injuries.

Is jazz bass hard to learn?

No it is hard. Players tend to develop a bit of a repertoire of changes from one chord leading in to the next - you've recognised this - sounds like you're on the right track.