What a fab friend you are! Keep it up - she will be needing you even more soon!
Ditto what others say. My advice would be to follow advice on MN in the first instance rather than look to parenting magazines, books etc - us MNetters probably have far less of an agenda.
One bit of advice that I don't think has been mentioned yet is to have a wander around your home town and find all the babyfiendly places BEFORE baby arrives. Trying to find a feeding room that doesn't resemble a police cell or a changing room about as hygienic as a sewer with a screaming hungry/wet newborn is not fun. Ditto trying to navigate the lifts/small doors etc.
My personal experience is:
John Lewis generally good
M & S generally OK
Debenhams theoretically good, actually appalling
Moto service stations passable
McArthur Glen designer outlets pretty good
Small cafes/shops etc either absolutely marvellous or attricious, no happy medium
Your question is a bit misleading - how to survive first baby. Undoubtedly it is hard, there will be miserable times but there are some absolutely brilliant ones too. It doesn't have to be a battle. I expected it to be and remember thinking I must have missed something when DH and I sat having dinner whilst watching film the whole way through with week old DS happily washed, fed and sleeping next to us.
Advice for you to help her is to socialise at her house for a few months - you bring takeaway and wine, get a cab home. She can keep an eye on baby, relax and can have some normal adult time with you.