I highly recommend that you consider enrolling in the physical course. The thing is, simply having theoretical knowledge is just a small part of the whole learning process. It is much more important to practice and experience how to perform resuscitation techniques. Actually feeling the process of performing chest compressions or giving mouth-to-mouth breaths will be immensely helpful in stressful situations.

Just to give you an idea, I have to retake the course every year. While the theory remains more or less the same, the key is to develop and maintain a practical understanding. It's about continually familiarizing yourself with the techniques and gaining a sense of confidence through hands-on practice.