Using old surfaces will be especially useful if you are a cautious painter or if you are used to using small amounts of paint. (arttutor.com)
This is simply done by having a very small amount of paint on your brush, and wiping the excess off on a cloth and lightly going over your furniture. (theswedishfurniture.com)
Only small amounts of paint, so simply buy tester pots. (idealhome.co.uk)