Watch the Other Time Signatures online guitar lesson by Angus Clark from Hard Rock Survival Guide: Rhythm
Stuff gets weird sometimes so don't forget to broaden your horizons and work on some odd time feels. In hard rock the odd time signatures are generally based on riffs that have an odd number of notes in them, and then you let the drummer do the counting. But this is not always the case, so get used to counting while you play. It comes in handy when the part is counter-intuitive and you need to get it done. You can feel your way into it later.