Liz, as was said, your fears are normal. Just remember that every child is different. We have two DD's who have completely different personalities and temperaments but that is what makes them interesting.

Every child goes through different stages as they grow up so with no 2 you are more likely to pick up the signs when this happens.

I think in alot of ways the second child can be easier as you at least have had a bit of experience, whereas with no 1 you are going in blind, you have nothing to guide you so you have to learn as you go.

All the best with your decision.