Learning to walk slowly and look pleasant

The bridesmaid's dress has been successfully altered to account for manufacturer error and the bridesmaid's expanded girth. At the wedding rehearsal today I learned the following things:

-the bridesmaids will proceed in ascending order of height, so I'm first.
-we have to walk slowly.
-we have to smile and look pleasant.

Those last two (or three, depending on how you look at it), in particular, do not come naturally to me. I'll look at it as a challenge.