We will use the lettering style on page 81. Either vertical or inclined lettering is acceptable, but don't mix both styles on one sheet. Most students use vertical lettering. You must always draw guidelines for your lettering, and these guidelines must not be erased. You may use a straightedge for guidelines only.
Many students use a template for making guidelines.
The best option is the required rolling ruler. You should disregard the numbers and arrows on the textbook examples. This is an attempt to show you how to make each individual stroke. It is much more important that you find a lettering method that suits you. Just try to get your letters to look like those in the book, and above all, try to be consistent.