So sdwa,
Did you find it a good or bad thing in the end? You did get through it despite the rather long time frame. Whenever I do something similar it is quite an adrenaline rush when I finish. Of course I never want to do whatever it is again either 
And no_doapmine – have a similar thing going on with a project I committed to doing last Spring but have not yet started. I’ve now actually scheduled time next week to get started. I decided it would be more likely to get done if I scheduled to come to their office instead of working on my own. It’s a freebie for a non-profit and I am looking forward to doing it on one hand but on the other I need to do this like I need a hole in the head ! However, that said, I thought about it before saying yes for about ….10 minutes at least. Pretty good for me