I wish to travel/fly on my own transatlantic.

this forum has been so helpful in the past, I wondered if someone could answer some questions or has any first hand experience of this.
I have ataxia and cannot walk. I have been on ba website and from my memory I am not confident at putting an oxygen mask on or reaching an emergency exit un aided.can they provide assistance in the case of an emergency on the aircraft?-

Thanks in advance!