Depends on how much I'm functioning.

If I'm functioning well I'll complete it out of obligation.

Poorly then I won't, and the night before my appointment I'll break down badly about how worthless I am because of not having done it and will lose about as much sleep as it would have taken as to have just done it in meltdown/sobbing fit/unable to control mood/unable to calm down and sleep.

I prefer just doing it.