Answer:
Be prepared
Step-by-step explanation:
To be prepared can simply be to be ready ahead of a task.
A person who is often prepared is ready to deal with a situation because preparation helps in starting a given task or work well.
Starting well is easy for a well prepared person because the person has put some important measure in place before starting.
A fully prepared person will understand everything he/she needs to know beforehand in such the person will understand several things that will be needed for a specific goal.
Example a student who is not prepared for he/her examination will tend to fail woefully which is why preparation is the key to success.
The guideline for developing confidence provided in the textbook according to Grace scenario means BE PREPARED because she was fully prepared ahead of her task which inturn help her to gain more confident in her self.