Packaging And Embellishments: If you're adding embellishments, or you're mailing more than just an invite plus an RSVP card (we opted to mail more info, because of the destination aspect), keep track of the weight of your invitation suite once it's all packed up. Depending on its size, you may be facing more postage fees than a simple stamp will cover. You can get a postage estimate using a kitchen scale and checking on the USPS website. Through the USPS website I also learned that square invites and envelopes cost more in postage, by a significant amount. It's not worth it.
Buying/Finding A Design: If you don't have design experience, and you're not fond of pushing images and text around on pages (aka, does the idea of designing a flyer for a Bake Sale or some other event excite you, or does it make you hide under your desk?), you're going to need to find someone to design your DIY wedding invitations for you. Fear not! Thanks to the Internet (and Etsy, bless), there are tons of places to get an invitation design. Some are even our sponsors! Here's a short list of places to check out.