Hi ya Duff, don't know if it's the case or not, but the only time I ever felt like that was when I re did the cabinets in my kitchen. I felt overwhelmed half way through. So much work....
If that's the case, make some goals for yourself that are attainable. ie, today I want to have the rough work done, or have it ready for paint.. whatever, just little steps. Keep it simple and enjoyable or it will become a job rather than something you like to do. Sometimes bringing over a buddy to have a look and (hopefully) getting some positive feedback on what you've accomplished can help too. It can help to try to see your work through someone elses eyes.
Overall, have fun, learn and "git-r-done" then show us lotsa pictures!