You must have plaster ceiling the whole house with some nice designs. A good plaster ceiling job will use water spirit to level.

Painting is normally not inclusive.

Do not require primer. Got budget paint better emulsion paint, no budget cheap emulsion will do too.

Yes, in order to ensure a leveled plaster ceiling. Otherwise, senget la.

I will be surprise to see the plaster contractor using laser leveling equipment. My contractor was using water spirit.

However, my window contractor was using laser leveling equipment.