J.M.
You are going to do great! I remember crying and crying toward the end of my second pregnancy, sure that my poor 2-year-old would go into shock from not being the center of my universe anymore. He was fine, though. And so was I. You'll be amazed at how much you love your new baby & how easily the little squirt will fit in to your family!
As for the c-section issue...accept any and all offers of help. Believe me. It is shocking how little activity it takes to over-exhert yourself after that surgery. Remember--you ARE recovering from surgery! Your body will need ample rest and nutrition to heal itself, and you'll be on some pretty major painkillers at first. Have your mom/m.i.l./best friend--somebody--stay with you for as long as possible. My mother & aunt stayed with me for the first week, then I had a couple days on my own, then my m.i.l. came for (I think...) 2 weeks. Then my husband took a week off & helped out. You really will need that help with grocery shopping, picking up your little girl & changing her/helping her on the potty, entertaining her, doing laundry. I thought I was taking it easy a week after #2 was born by just filling up a wading pool & letting my 2 year old splash around...I just planned to sit with my feet in the pool & the baby on my lap...next thing I knew I was hemmoraging, which my doc said was probably from carrying the tiny plastic pool and going up the stairs to my bedroom! So relax, ask for, and accept plenty of help!
Congrats on the new baby--have fun!