The most important thing from my experience, is to make sure you are not stressed out. In my opinion all of these things are practically impossible with a new baby in the house. I managed to pump for my baby for about 2 months and then I realized that it just wasn't worth it anymore. It was all consuming and he needed me more than he needed my breastmilk. Your baby will benefit from the breastmilk, even if you only do it for a week.
Some moms are able to do it for the whole first year and find it very rewarding.
When it isn't working for your family any more, it is OK to stop. I had a very hard time stopping, because I felt like a failure. We all need to remember that while breastmilk is the ideal food for a baby when breastfeeding is possible, they will also thrive on formula when it is not. I was so afraid of giving my baby that first bottle of formula. I thought he would instantly become sick.