If you are having interior painting being done then there are some thing you can do to make the job easier: remove pictures from walls, move furniture to the middle of the rooms and cover where possible, remove switch plate covers of lights and powerpoints.
It is recommended to open windows and doors for 1 to 2 weeks to help the paint cure, avoid any fumes and stop the doors and windows from sticking to their frames.
Primer is an undercoat that can be applied to help paint adhere to the surfaces being painted. By using primer you should get a more even and longer lasting finish for your paintwork.
Water based paints refer to paints than are non-oil based paints. The non-oil paints used to be inferior to oil based paints for some applications, but as technology has improved these disadvantages have diminished and new quick-drying acrylic paints are performing well.
Depending on house construction, paint types used and weather conditions this can range from every couple of years to every 10 years.