The most important thing with this job was to be patient and concentrate on each of the stages involved in each of the sections in their own right. The stages for each section involved:
STAGE-1. Applying tape and bonding out over it to create a level playing field. Then waiting for that to dry before moving on to stage 2.
STAGE-2. Applying blue grit to the area, and waiting for that to dry (24 hours) before moving on to stage 3. I used blue grit on this job because it is a superior bonding agent to the more commonly used pva. This is because it contains a fine aggregate that provides an improved key for the application of multi-finish plaster. Every little bit of bonding power helps - especially when plastering overhead, and with numerous awkward angles.
STAGE-3. Applying two coats of multi-finish plaster.