I use the Sew and Flip method of piecing for my crazy quilts so that is what I will be sharing here.
Choose your first piece of fabric and cut a 5 sided piece. You'll be working off of this center piece.
Flip it over and press.
The reason for the excess fabric is because the stitching and embellishments can distort the shape of the block. With the extra all the way around, you can get a good straight square when you trim your piece for finishing.
And that's all there is to it!