First invite some friends over, put on some music, and have fun! This is a momentous occasion—an official milestone on your way to your actual wedding! Secondly—you can use this traditional way to put a wedding invitation set into an envelope.
Invitation is on the bottom of the stack, text side up.
All other pieces should be arranged by size, smallest on top. Slip the reply card under the flap of the reply card envelope (which should have a postage stamp on it of course!).
Insert everything into the envelope, text side up. The right-hand side of the invitation should be closest to the envelope flap. Slip the inner envelope (if using one) into the outer envelope. When guests open the outer envelope, they should see their name written on the inner envelope.