Hi Airlie,
It will be better than you think so don't worry too much.
I had 12 weeks of Paclitaxel with no side effects to speak of at all until the last week when I got a bit dizzy. Just be sure to take all your pre and post meds over the treatment period - it helps to keep a chart you can tick off as there are a few of them!
You will probably have a blood test each week to monitor your progress and get weighed each week for dosage as well. It passes quickly.
Good luck! I didn't have Herceptin so can't comment. xx Michelle