Mastering involves applying various processors, such as EQ, compression, limiting, saturation, stereo enhancement, etc., to your mix to improve its overall quality and loudness. However, using too many or too few processors can have negative effects on your mix, such as over-compression, distortion, phase issues, or loss of dynamics. Therefore, it's important to experiment with different mastering processors and settings, and listen to how they affect your mix. You can also use a bypass function or a wet/dry knob to compare the processed and unprocessed versions of your mix and see if the changes are beneficial or not. You want to use the mastering processors sparingly and subtly, and only apply them when they are needed to solve a specific problem or enhance a certain aspect of your mix.