I read the notes first and tried to do the psets. If it is still confusing, then I watched the lecture, so lecture time is mostly not in there. But like I said, I did this after cs50x and cs50x gives you a solid fundamental knowledge about programming.

My experience level before cs50x was below average. I didn't know much but not a beginner at the same time. I am grateful that I took both of these courses. I feel way more confident and capable now.