It depends on what kind of caging you are using. If you are using a glass tank with a screen top, you're gonna have to worka little harder to raise your humidity. If you are using a rubbermaid or customized cage, it won't be hard at all. Some easy ways to raise humidity are:

-using a larger water dish.
-Misting the cage.
-adding a humid hide to the cage.
-using cypress mulch as a substrate (this stuff hols humidity like none other).