I also did the two year program. My first semester was spent as a GMC, and second semester as POC but with a requirement to participate in all field training prep activities. Back then (2001 timeframe), there was a 4 week, 5 week, and 7 week FT. The 4 week were for the 3 and 4 year cadets. The 5 week was for the 2 year program cadets and the 7 week was for the 1 year program (the 7 week cadets just showed up two weeks early and finished the last 5 weeks with the 5 week campers).
As far as doing well in ROTC, no, it's not hard. Just be committed, listen to your classmates and be ready to learn. It helps if you have some background of some sort in drilling, and other military aspects, etc. but it won't hurt you too bad if you don't.
You may also find that when you return from FT, you are on par with your fellow cadets in your year group and have the options to hold any position that they could hold (some of the higher jobs in the wing - if you so choose).