I started it this year, and I remember everyone telling how hellish it will be and a MASSSIVE jump,
From my experience, that's all a bit of exaggeration, yeah there's is a jump, but if you face it with the right attitude then you'll do fine. By right I mean, doing your HW, extra reading, notes, paying attention, and patience, you need A LOT of that, because when you manage to understand a topic, you'll feel like Einstein! Trust me that's a great feeling!
oh and get your self a CGP book, you wont live to regret it!