Expect the Unexpected
No one is perfect, and as adorable as kids may be,
they can also be very unpredictable. Some are shy,
some are extremely energetic, some can become easily upset. and some seem to have a totally different personality when your big day finally arrives. If you approach the day with a "let's see what happens" attitude, being prepared to take everything in stride, and have a backup plan, everything should work out for both you and the children.
Make Sure the Kids Want to Participate
Your little niece or nephew may be so precious that you can't imagine them not being your flower girl and ring bearer. Your teenage stepdaughter would make the perfect junior bridesmaid. You have imagined how perfect your entry into the ceremony will be, and how delightful it is to have these kids who mean so much to you being part of your big day. Just make sure when you ask them to participate, you honor their response. If they don't want to be a part of the ceremony, pressuring them to be involved can end up with less than delightful results, no matter how much you have imagined it differently.