I took an approach like that too. Since I'm much more comfortable with 2D than 3D, I made a 2D game. At the moment, it's on the verge of release. I'm fixing a strange bug with the save/load system at the moment, then I need the full edition access key and I'm set, short of figuring out Regnow or some other service to sell my game on. With all the practice I've gotten with my 2D game, I can do a lot more with my other 3D game I also have in the works. I'm likely to have other smaller side projects as well. The same could go for you. Start working on a smaller, simpler side project to gain skill, then, as your skill level increases, work on your dream project.