First I wash my ties, than take them apart. I use muslin as foundation, here I cut them 10.5 ". I also use light iron on stabilizer, the one with glue only on one side.
I chose red a my middle color, so, I start with a red tie making sure I have the right length before I cut it. Then I iron the tie and cut a piece of stabilizer that will fit. I iron it to the back of my tie.
I also trim the sides of the tie making sure I have the width I want.