To practice yoga by yourself, it's best to find a big mirror, where you can see your movements and then correct them bit by bit with reference to the figures in the book. When practicing yoga for the first time, especially when adjusting breathing, if you are too nervous, you will have palpitations, nausea and cold sweat. Relax, don't care about breathing, and gradually get familiar with the movements. These situations will naturally disappear. If the action is not done correctly, it will have no effect on the body, but if the breathing is not adjusted well, it will have a serious impact on the body.
Yoga can only practice one movement, but it can only shape a certain part of the body and can't achieve the effect of shaping the whole body.