To be honest, I found LISP to be a lot easier than SICP, but that's probably just some learning styles stuff at play.
SICP being freely available in both book form, and the lectures [0] makes it one of the best resources out there.
(I just never found it's section on compilers that helpful. Again, probably learning styles.)
[0] https://www.youtube.com/playlist?list=PLB63C06FAF154F047