Step 1
The first step is to get a referance point, which in most cases is home plate.
Start your three tapes from the back of home plate. (see picture below)
Each tape will go to a base.

Step 2
Pull the tapes that go to 1st and 3rd base like you would if you were setting up
a field to be chalked for a game. With the tape on the foul side of the base.
It is hard to see, but the picture below shows that this 1st base is almost
3 inches to far away from home plate.
