Keep a tiny pencil sharpener in your nail pouch to keep a nice sharp point.
You know that old freezer "Uncle Harry" gave you to use in the basement so you could save money by storing on-sale food items? Well, it costs more to run that freezer for a year than you'll ever see in returns on food savings. If you're looking to save energy, and money, it makes more sense to have only one, well running, efficient refrigerator/freezer.
When painting from a paint can, give it a half turn periodically throughout the job. Dipping the brush into the can alternately on one side of the can and then the other automatically keeps the contents stirred at the surface and prevents a surface film from forming. Also occasionally sweep the tip of the brush back and forth through the paint, especially with a fast-drying latex.