How do I use X Plugin/Software or gear for mastering?
Use your ears! There are no set rules such as what ratio and threshold to set your compressor or what levels to set your songs at. Don’t overdo anything, chances are if you hear an audible difference then you’ve used too much. Compare your “masters” with non-touched mixes at EQUAL volume. If you’re having trouble getting started with the EQ look up one of the EQ primers floating around the web. Just use your ears and if you’re monitoring system isn’t very good, double check on a range of different speakers.