I am flummoxed as to how to paint the wall adjacent to the stair case. How do I reach the top bits without risk of killing myself. ie there is no way I can place the ladder on the stairs steps securely.
You can usually reach all parts of a stairwell with two ladder placings.
First, sit the ladder on one of the steps and rest the top of it onto the back wall of the stairwell - the one over the downward of the steps. It's a question of placing the ladder on the correct step to get the angle right. Wrap towels or cloths around the top of the ladder to prevent damage to the wall.
Secondly, place a smaller ladder (or the same ladder retracted to a shorter length) so that it rests on the top of the winder steps with the top on the stairwell flank wall.
In this way you should find that with care you can reach the whole of the stairwell, including the ceiling. If you find you're stretching a bit too much use a small 4" foam roller on a long handle.
I was going to suggest a long handled roller, but in practice you need to get up there to do the finicky bits. I don't have these problems these days but if I did I would get a proper man in. (I love that expression "Get a proper man in")...