Once everything was glued down, I used blue painter's tape to cover the edge of my table just even with the surface of the table. This is usually recommended to avoid drips of resin from drying to sides of your project, but I did it to keep the duct tape from getting my table all sticky (see Step 6).
Don't forget to also tape up any holes on the surface of your table. I did this from underneath so that the blue tape wouldn't show once the resin was applied. If you have a table surface with lots of openings (like a metal mesh or expanded metal), you may want to get a piece of Plexiglas or MDF and use that for your tabletop.