DO give yourself enough time to complete the project - weeks and months if necessary
DO a test run to know exactly how many materials you'll need, how long it will take you and how complicated the project is
DO ask friends and relatives (aka bridesmaids) to help
DON'T forget that time is money so compare the time you'll be spending to complete a project vs. how much it would be in savings. Saving $200 may not be worth three weeks of nights crafting
DON'T be upset with yourself if you can't complete the project
You DON'T have to DIY every element of your wedding just because you think you're a DIY bride. Pick and choose the projects you want to do