You need to know exactly how much brick mold you need to cover the area.
How to install brick molding around a garage door.
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Then place the pry bar between the door jam and brick mold.
The inside miter cuts will each start at the side reveal marks.
Hammer and pry the old brick mold off.
You will need to make miter cuts on the molding which involves a 45 degree angle so that you can slot the pieces together.
Nail using 10d nails every 8 to 10 inches along the molding and into the header immediately above the garage door.
I used the knife and then had to use a flat screwdriver to removed the old caulking.
Measure several times to ensure that you get it right and then travel to your local hardware store and pick up a suitable amount.
Center your brick molding on the jamb with a 1 2 inch reveal.
First take your utility knife around the outside edge where the old caulking is.
Determine the lineal footage of brick molding needed for both sides and across the top of the garage door opening.