Organic Chemistry (at intro level) is not a hard course as long as you are willing to put in the time. Do not listen to the horror stories because those come from students who did not put in the time. The first semester of organic chemistry is focused on structure (stereochemistry) and the basic mechanisms of 4 reactions (addition, elimination, substitution, and rearrangement). The concepts are very basic but there is a lot of information which is what makes the course "hard". If you put in the time, you may find it even easier than general chemistry (I did). Do not approach the course by memorization or you will make it much harder on yourself. Understand the movement of electrons (what bonds are breaking and what bonds are forming). By working and thoroughly understanding the homework problems, this will come easy on exams. If you really want to get a head start (although I don't think it's necessary if you study hard), I would review stereochemistry since that seems to be the most confusing aspect of the first semester of the course due to the visualization. Good luck!