I recommend breaking your project up into attainable milestones. Each of these milestones should be releaseable, complete games. For instance, for the first one, make a simple single player game that is a mech that goes around blowing stuff up. It really lets you get into the engine and learn the commands and gives you a playable demo to show off, which makes you feel good.
Myself, I'm looking at releasing my first milestone project this spring.
Don't let anybody tell you that you can't do it. Take any criticism for the feedback it offers. Take advantage of the community here. Post blogs, videos, and gameplay demos. I've received great feedback from these guys.