Similar to perfectionism/procrastination cycle:

I have to be very careful about the first step, because it will determine whether this whole thing will be an outstanding success or not.

Oh crap, I took too long on the first step, and now there’s no way for it to be perfect. I hope it doesn’t look like I tried.

By the time I feel good enough to do something, I’m just happy to feel good enough to do something, so I don’t do anything because I’m afraid it will go away, and then nothing gets done and I feel like shit.