[Side note: Sometimes bloggers DIY in their really pretty home studios. Sometimes they edit their pictures. Sometimes they manipulate stuff to create the allure of a highly styled publication. I don't do those things (except add snow to my pictures. Snow makes everything look prettier). All of the following pictures were taken in my post-Christmas-almost-post-apocalyptic dining room. It was and is still a gigantic mess. But I did have a super cute helper!]
Step 1. Gather what you've got. Buy what you don't.
In my case, I already had some old tomato cages and a garden urn that I could repurpose. If you don't have those things, you'll need to buy them. You'll also need some wire twisty thingies (I bought a wire garland on the Deco Mesh aisle), some ribbon, lights if you want them, and some kind of topper (that required a second trip to Michael's because, try as I might, I can't make a decent looking bow).
You'll see it, smile and say, "Oh Yeah!" and then feel the merriment seeping into your veins. It'll be legend... wait for it! ... dary! Happy new year friends!