Worst Advice from MIL - "You only need to breastfeed 6 weeks" as if.
Worst Advice to DH from MIL "Don't listen to her, she is hormonal and stupid"

Worst advice from book - "Accept all offers of help" should have read "accept all positive offers of help". The help I received came with loads of bad advice (see above for examples), I would rather had not had it.

Best Advice - same as some of the others, sleep when the baby sleeps.