New and old plaster blending

[Kmurphy]

I have a had a staircase replaced, there is an area under the stairs, about a foot which has been plastered, this meets the existing wall, which is painted. I now need to blend these together.

My plan is:
1. Sand the join and a bit either side so it's generally blended together at the join
2. 'Prime' the plaster work with watered down emulsion
3. Paint whole area, new and old with a couple of coats of new paint colour

Anything I'm forgetting?

 

[Robbie uk]

May need some filler along the way if there are any undulations in the plaster, but generally on the right track

 

[Kmurphy]

Is it a good idea to buy a multi platform thing so I can reach the tricky bits? The area is above existing stairs.

I'm not sure if there is an easy trick to reaching it

 

[Robbie uk]

I generally use a ladder and plank back to a pair of steps. Never had any problems.