Tell her that nobody is ready. You learn along the way.
I can share a couple of things about breastfeeding because I actually went to "school" about those things (a training center for mothers). As a result, I successfully breastfed for two years each child.
BREASTFEEDING DOs and DON'Ts
1. Breastfeed when the child wants, forget about the clock.
2. Only one breast at a time. The first milk is thin, and it's good for hydrating, the last milk is thicker, it has more nutrients. Let the child finish completely one breast.
3. Never give other liquids like water, chamomile etc.
4. Never give a pacifier. The breast will do.
5. For six months, nothing else than breastmilk (you may have to pump some if going back to work). 7th month: substitute one meal for fruit. 8th month: substitute another meal with vegetables. You can grate almonds and put dried raisins in the fruit cream, for iron. Don't give cereal creams, the baby will become fat and its stomach can't digest grains that well yet.
If you are a meat eater, no meat before the 1st year. Also no walnuts, strawberries, chocolate, eggs.
After 1 year or so, introduce all those other foods. No sugar, ever. You can keep just 1-2 breastfeeding meals, one of them of course before sleeping. And of course any time the child is stressed or needs pacifying. You will not use plastic pacifyers which are bad for gums and for teeth development and become an addiction.
BREASTFEEDING TECHNIQUE (VERY IMPORTANT)
Rest near the end of a sofa or on an armchair, with a pillow on your lap, and put the child on the pillow.
You want to have control on the nipple (where it goes and when) and of the baby's head.
So, forget about this image, which leaves the baby free to bite you.
Maybe later, when you will both have become "pros"
So, with one hand cup your breast from below, with the other hold the child's head from behind.
This is the best position for the start. The cushion supports the baby and you have both hands free to control what's going on with the feeding.
Later on, you can change it.
What's so important about control? Well, you don't want the baby to bite your nipple. That's about it, and it's all-important.
NEVER give him the breast unless he opens his mouth VEEEEERY wide so that he can take the hole aureola, not just the nipple. Otherwise you can expect wounds and you'll have to stop breastfeeding. Fresh gums can be as sharp as teeth! You can stimulate the baby to open the mouth wider by touching its lips with the nipple (teasing?)
See here. This opening is NOT enough. Naah, little guy, you'll have to do better than that if you want to drink that milk.
That's the opening you're aiming for!
Here's a drawing to help you visualize it better:
and when it "latches" on:
Later on, when the baby is used to opening the mouth every time, you just have to guide its head with your elbow, so you can do this position.
And many others.
After a few months, you'll both be so used to it that you will be able to breastfeed in any position, even while hanging from a branch!
HAPPY AND LONG SLEEPA SLING
This is the position for the night.
The single best tip I can share is: make yourself a favour and sleep with your child. You can put a wooden fence at the outside of the bed, with a soft padding, then the child outside, you in the middle and your partner on your other side. This way you can have sex without the baby waking up, you can breastfeed without your partner waking up, and almost without you waking up completely. Blissful sleep!
This is the safety rail I'm talking about. But be sure to put some fluffy thing to cushion it. Not pillow.
The next and last tip for today: tell the new mom to buy a soft padded sling. For carrying, breastfeeding, everything.
In the next picture, the breast is visible, but for discreet breastfeeding while outside, you can cover the baby's head and your breast with the sling, and nobody sees anything. You can also carry a very light (almost transparent) cotton shawl to cover even more.
Lastly, the dad can use it too for carrying:
Look on youtube for "ring sling" and you'll find tons of videos.