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Before any of that, quickly go over the whole room with a sanding block and take back any blobs of plaster or imperfections.
I personally go for skirting once the walls are misted. Decent quality caulk over top edge of skirting, then primer over that so that the skirting paint doesn't get fussy. Take the skirting paint (or maybe you are varnishing) over the top edge, maybe a centimeter over onto the plaster. If the wood is knotty then you can run woodfiller over the knots and sand back first before painting.
Skirting is more of a pain in older houses as the walls are never staright, nor square. I once attempted straight mitred corners in a room in my Victorian house. Never again: always scribe them out as they will never fit perfectly.
Number of coats can be quite variable depending on how much your plaster sucks, or if it decides it doesn't want to suck at all and the paint doesn't adhere brilliantly (sometimes when too much PVA has been used).
I think paying for higher opacity paint is worth it for the time it potentially saves.
Right so I've got freshly plastered walls and no radiators and I'm getting pretty cold.
What's the order of works now?
Mist coat
1st coat where radiators will be
1st coat everywhere else - or end of the day
2nd coat behind radiators
fit radiators
2nd coat everywhere else
lay floor
3rd coat
Skirting
?