They say that we overestimate what we can do in the short term, and underestimate what we can do in the long term. As someone who's had his share of overstuffed todo lists, I believe that this is true.
You might find it to be useful to think two years in advance. There's some magic to that number-- it's not so far off that you can't imagine it. If you're thirty, for example, turning forty might seem so abstract as to be impossible, but certainly you can imagine thirty two.
And, as part of that imagining, you can also imagine what you might like to be different in those two years. After all, your needs and preferences will likely be about the same.
Although two years is short enough to visualize, it's also long enough to do just about anything. The idea of one's life changing in a day is a fairy tale, but changing completely in two years isn't even all that glamorous or dramatic.