I needed to extend tinymce to allow images to be selected from a list of thumbnails so they could be used in the editor. I thought, "Oh man, this is going to be hard!". My fear almost convinced me to not do it.
It took a little effort to get myself up off my rump and just start on it, I think that's always the hardest part. What I found was that it wasn't that hard at all, and I enjoyed the event as a whole. Now this may be a testement to the awesomeness of tinymce, but this happens to me all the time.
Sometimes I forget how much I love programming, and I let the fear of something new or different impede my progress as a developer. It's very irrational and something I hope to overcome.