well first I need to say that I just found out that I am America's first Space Booster ... shazaaaamm!
second, your question has been answerd like 1,000,000 times on this, and many other recording forums.
So once again,
Q) what is your mastering process
A) whatever the song needs ... i.e. some people use multiband compression, EQ sweetening, light single band compression, limiting, room modelling - this is only one aspect of mastering - the processing. In reality, this type of home mastering can help you figure out what's wrong with your mix rather than give you a "final copy". If you are serious, get to a real mastering studio with your mixes. And if for some reason you can't make good mixes, then spend money and get your stuff recorded and mixed at a semi-pro or pro studio.
If you are in it for pure fun/self-education and not cash ... grab a multiband compressor, a limiter and
a linear phase EQ and have some fun with "home mastering".
also, read read read read before asking anything. Chances are it's already been asked before and you can avoide blokes like me dishing out half answers that will confuse you more than help you.