breastfeeding ??

Right mums, I want to try breastfeeding with this little one, she's due in 5 weeks, some days it's what I want to do it 100% and others I don't want to! Have people found it easy or hard? I've got 7 year old twin girls too but I bottle fed them. I worry about how I'd feed her if we were all out in town together or if I was at a swimming lesson with the girls and the baby needed feeding, I know it's not as easy as just bottle feeding but I find so many reasons not to and so many reasons too Aswell! I'm in 2 minds xx