The other day, I realized that the trick to taking on big projects (like, ahem, weddings) is to break them down into smaller, concrete next steps.
For example, in order to produce the next issue of my neighborhood newsletter, I didn't just write "create newsletter" on my action plan. I broke it down into many smaller steps and assigned each step a deadline: send out article request, send reminder about due date to contributors, edit and format submitted articles, submit copy to printer, pick up copies and give them to the distributor.
Matt and I had to do the same thing when planning our wedding. At one point, we were utterly overwhelmed by how much stuff we had to do. It helped us immensely to break the big items (e.g., "Food") into all the smaller components and spread them out over our remaining months. We stopped worrying about everything all at once (like a giant, amorphous blob) and instead focused on whichever tasks had to be complete that week.
Any other strategies for tackling a project as big as a wedding?