I tried to do the honors calc sequence through OCW and I found that I really couldn't hack it on the textbook alone, I'd get ~60% on my self-graded homeworks and I'd spend weeks on individual problems. Often I'd get stuck just trying to figure out the notation, which differed from the book. And I found that the recorded lecture material runs out pretty quick beyond intro level classes.

I ended up enrolling in the math 23 sequence at the Harvard Extension School and found it to be a lot more valuable.