First, I wrap the wreath with a non-wired ribbon to cover the white and seal in the flaky Styrofoam.
Cut the tulips bushes by pushing up the greenery towards the head and leaving about an inch or two below the flowers so that you have plenty of room to pin it.
Grab 3 bundles of flowers and using the floral pins, pin the flowers to the wreath with a dot of hot glue on top to make sure it doesn't come loose.
One you've gone all the way around the face of the wreath, the do the sides. But this time, use 2 bundles instead of 3 around the edges. With the 12" size, I haven't found the need to cover the inner circle/hole.