mobility scooter use in city centre

so i live in the city centre but i cant walk very far (because of various ailments) and ive been considering getting a mobility scooter. can anyone in the city who uses one share their experiences with getting around bristol? are the pavements flat enough? how do you open doors with one? do you have to get out and push it through? or do you leave it outside? sorry if its a stupid question. i imagine them being very freeing in terms of getting outside for a long "walk", but storing it, getting it into cafes ect, seems light a nightmare for me (also because of the various ailments). for context, i live in a flat with no bike store or parking