I understand that. I don't need to do those problems. Watching the professor or your tutor or your friends work a problem is not the same as doing it yourself. Simply watching someone else play the piano or use a typewriter or play tennis would not enable you to play the piano or type or play tennis. You have to practice it yourself.
Chemistry requires a lot of practice.
Your textbook and study guide will show you how to work problems step by step. If you can read through the steps and understand them, that is a good start. But it is not a substitute for doing the problems yourself. After you have read the book and the examples on how to work a kind of problem, try one yourself, without looking at the book or study guide. After you have finished the problem, check yourself with the study guide, but be careful not to peek at the answer to the next problem.