I felt highly emotional and vulnerable for most of those first six weeks. That's not to say I felt bad all the time, I was absolutely in love with my little baby and spent hours and hours staring at him and cuddling and smelling his lovely little head. However I was also very tearful, anxious and tired for a lot of it.
Breastfeeding got off to a slightly rocky start, my son had prolonged jaundice and also would only sleep on my or my husband's chest for ages. I am much more experienced with babies now and looking back I'd have done various things like combi feeding from the start, swaddling, putting an extra blanket on a tiny chilly baby, etc but I was a brand new mum and really wanted to do things completely by the book.
My son was born in the early hours of a Friday and my milk only came in on the Monday evening. That Monday was one of the worst I have ever felt in my life. My anxiety felt off the scale and I have never felt more useless. It felt like the worst PMT ever. I actually threw myself on the bed screaming and crying at one point. My husband was very alarmed and called a midwife to check on me. When my milk did come in the awful feeling vanished like magic - like PMT does for me as well.
I also broke down in tears at a breastfeeding support group the first day my husband went back to work and I was alone with my 2 week old baby. The peer support lady was very lovely and a group of more experienced mums actually came over and asked me to join them for lunch in the pub afterwards 
So, yes - ups and downs and lots of emotions. It's different for everyone but I'd advise a new first time mum to plan those first six weeks on the basis that she'll at least need to be kind and gentle to herself, take things slowly and have as much support as she can on hand.