Start with the hardest task you have. Prepare yourself for it, and "force" yourself to do it. Once you will have it done, you'll be more willing to complete the rest of your list. I hope I could help you. Good luck.
I try not to list too many tasks at one time. I think three maximum tasks on a daily basis is more than enough. As a matter of fact, Fabulous recommends three and finishing one task before taking on another on your to-do list. I find that this works best. There is actually a quote that comes up daily in my routine as a reminder. Now it’s almost automatic writing my list and completing them by prioriting.