Decide how you would like to layout your studs. For our blazer, we measured the shoulder area and made pencil marks!
Push the first stud through the material of your blazer. Push nice and hard to make sure all prongs make it through the lining.
Now push prongs in to the lining. They are soft enough to push by hand, so fasten them nice n' good!
Here is an after look for the previous step.
When the first side is done, it should look like this :)
Repeat process on the other shoulder of your blazer.