How to get patches right on plastered plasterboard.Make good help

I had to open few hole to fish out cable for downlights. How do I make good on the right way?

 

Skrim tape easi-fill and sandpaper.

 

Will keep same level without any build up?

 

You can feather it out over a few inches either side of the patch, will need a couple of coats.

 

dont need scrim . stick the old bits back , slightly lower if possible and skim over with toupret filler.

 

What the best way to mix filler. Water only, paint only or water and paint?

 

water only

 

add the powder to the water.

 

PVA edges of plasterboard holes and biscuits before filling.