Say you just want to freshen up the walls of your apartment using the original paint color - the standard instruction is you need to prime the walls and then apply two coats. All these guides however assume you are painting a different colour.
The walls in my apartment are pretty new, the apartment itself is only 8 years old. The color is a very soft light neutral tone - probably the best way to describe it is a warm off white.
Is it necessary to prime the walls under these circumstances?
And also, how do I determine if more than one coat will be necessary?