I do recommend using the book when doing ACIM because there is important information and instruction that for time I can not include.
For the longer practice period, begin by reviewing the idea for the day:
My only function is the one God gave me.
In the shorter practice periods, which should be undertaken at least once an hour, use this form in applying today’s idea:
My only function is the one God gave. I want no other and I have no other.