Showing you some tools that will be required. A brush, a paint, paint plate, staircase or long stick for higher wall.
Prework and method that i used. I cover the edges of ceiling,switch and door edges using a masking tape..purposely to ensure the painting will not spill to unwanted area. Finishing the prework,I painted the wall zig-zag. Thin layer paint covering the area and then following the 2nd and 3rd layer. For me i only make 2 layers as the wall already look evenly painted.
1.use long stick rather than stairs(not tiring)
2.use old mat/cardboard rather than newsaper as a floor cover.newspaper will easily moved(full force fan) and flowing.
3.quickly clean area splashed with paint with wet towel.dont wait till the paint dry.
4.paint with smile :D
Hope it'll helps.