Stamps are usually used with stamp pads. When applying paint from pad to stamp, a good strategy is to use the "clap hands" strategy. But that instead you have a pad in one hand and a stamp in the other. Then you will more easily get the right amount of color from the pad to the stamp.
The majority have that one part rests on a hard surface and that the other part is held and pressed against. This can cause there to be too much weight and too much paint in places that then land incorrectly.