Sorry you had such a bad time before. Not all mws know much about bf. Some auxiliary nurses know even less. The best way you can prepare is mentally and on your birth plan, what you are and aren't prepared to allow.
Things that can help establishment of bf:
FAITH on the part of the mother, in her own body. Things are usually easier second time round
delivering baby on to mother's stomach
(not whisking away soon as born)
putting new baby to the breast soon after birth, ideally within 2 hours (full feed not essential, just a quick latch on is enough)
mother putting baby to breast herself (ie 'hands off' approach from midwives)
feeding on demand (not by the clock)
Things that can hinder establishment of bf
forcing baby on to breast when baby not interested eg when asleep
introducing a bottle (of any liquid whatsoever)
baby being affected by drugs used during birth. Entonox (gas and air) doesn't affect the baby, but pethidine and epidural drugs do.