Because I always need something to look forward to, I have a list of mini-goals a mile long. I hit the latest one today. I have less than 100 pounds left to go. Two digits just feels so much more doable than three ever did (especially the high three's). I feel like I can do this and that feels great.
I was looking at some of the other goals I have on my list that are so much closer than I imagined I'd ever be to them and again, it gives me hope. I'm 44 pounds from no longer being obese. I'm 13 pounds from being half way to my goal. I'm 25.4 pounds from having lost 100 pounds. And all of those feel completely reachable. If I'm overwhelmed, I just change my perspective and focus on something really close.
If you are just looking at your end goal as the only milestone to look forward to, I highly suggest finding little mini-goals to look forward to! It makes the long road so much more interesting...