I just got off it a few months ago, so I'll tell you all about it. Yes, there will be a initial breakout, it should start after about a week of taking it. The most common side effect that you will experience is dryness, so stock up on moisturizers and chap-stick. In rare cases you get stomach pain or violent tendencies, but I never got them and there rare, but if you do get them let your family/doctor know. After about 2-3 months you should notice your skin REALLY clearing up though, but you still need to keep going after that for at least 5 months total. Also, you CANNOT get pregnant while on this, or your baby will have horrific birth defects.
I hope all this info helps, and good luck!