Joy,
Breathe....in and out, slowly....we don't want you hyperventilating! The one thing you didn't say that you had done was to practice with the same materials. If I were going to put it off for a bit longer, I'd like to think that I would practice....but a cuppa something and a book does sound safer....however, you've come this far, I'd say go for it! You will do exactly what you need to do.
Blessings.