This is the book that got me through all my practical exams in nursing school Clinical Nursing Skills: Basic to Advanced Skills (7th Edition): Sandra F. Smith, Donna J. Duell RN MS, Barbara C. Martin: 9780132243551: Amazon.com: Books
Even if your professor wants to see things slightly different from the book, if you think the procedure through logically you will internalize it better. Most important to any of the procedures you learn will be infection control. Pay careful attention to which hand is clean and which hand is dirty and you'll understand that most of the steps you are taking involve avoiding contamination.
Everyone does things a little differently so your professor is not likely to follow the same steps as a book, but if you take notes during the demonstration, use the book as a guide, think things through, and practice with your classmates you are definitely on the right track.