With a DIY wedding, you are really relying on the kindness of friends and family. Make sure to say thanks, whether with a card, a hug, a homemade gift, or a small present.
A family friend provided horse and buggy transportation for us. It was a wonderful touch, and I have to say, if you can do something similar, it will give the bride and groom essential breathing space between the ceremony and the reception. It may be the only time in the entire night that you have to talk to each other!