I'm sitting at my computer doing all the pre-tasks right now!!

Totally doable. Go for it.

Yes, I know people who have done it while breastfeeding. My DS2 had *just* weaned when I started in round 1 early this year, so I've always done the basic program.

Be really, REALLY sure that you have all your calories - while you're completely able to exercise and eat healthily on the program, and breastfeed at the same time, be sure that you're eating and drinking enough.

And jump on the phone to the ABA (or the bf forums here) if you have any specific questions about that side of things.

Good luck!