I also found Chemistry very challenging. We had an instructor who, although very nice and extremely intelligent, explained things more on a masters program level than an "I have no clue what I am doing yet" level.
What worked for me:
Every day in class, I would take thorough notes, listen intently...all the while thinking, "HUH?". Then I would go home, sit down with my notes at the computer and look up HIGH SCHOOL chemistry sites that explained concepts in plain English. With that, and a mere 20 hours

of study a week, I did great!
P.S. In my opinion, the most frustrating thing about Chemistry is that, when explained properly, it is not THAT hard. I remember sitting for hours reading my book, trying to answer the homework questions. I would be haggling with something, trying to figure out what the heck they were talking about...then when I finally would figure it out, I would be ticked off that they made a simple concept so dang hard to understand.