The thought of having someone be proficient with polishing concrete floors without prior experience is preposterous. There have been a fair number of tricks to learn, which unfortunately won't happen overnight. People still ask me how it's done, though, in the interest of learning it themselves. To them, I say this; if you want polished concrete floors, find someone who knows how to do it.
I am more lenient to those who wish to be an expert on polished concrete, though. To these people, I suggest taking three things to heart; you should understand the process, practice what you understood, and have the right tools for the job. These three are all interconnected, and you got to have them to attract potential customers.
The first thing that you have to understand is the way concrete polishing works. At it's core, you grind a portion of the surface to expose the aggregate, and then start with the actual polishing process. The coarse grind requires low grit diamonds, 40 in my machine, and you'll have to go progressively higher as you shift from coarse grinding to polishing.
The second tidbit of advice comes in the form of knowing the equipment your using. You of course need the machine, from which there are many brands to choose from. Your choice of machine also dictates the various grit of diamonds that you need to have. All these information can be asked from Concrete Polishing.
Finally, you need to be able to practice your craft. Some of the available options would be: Apply in a crash course, or work under another floor contractor for some time. We would be able to help out, either way.