One that knocked me upside the head once was, upon remarking "That's going to take a long time, like a year" to accomplish something, as if that made it not worth doing, being told, "That time is going to pass anyway." In other words, you can either start working towards it now, and be in a better place in a year, or let that length of time discourage you and then, when next year rolls around, still be discouraged. So just start.