ATTACH FABRIC TO MAGNET 

First, make sure your fabric is nice and flat (press it if it's not). 

If you are using large sheets of magnet stickers, cut the paper down into smaller rectangles more suitable to your letter size. 

Lay the fabric right side down on the table. Remove the paper from the sticky side of the magnet and affix the magnet to the fabric.

Apply pressure with your palm to make a solid bond.
Using your regular fabric scissors, cut out the magnet and fabric.  Set aside the excess fabric. 

TRACE AND CUT LETTER

Place magnet on the table with the fabric side down. Place the letter right side down on the magnet (the letter should be reversed so that when you turn the magnet right side up, the letter will be readable).

Trace around the letter with your permanent marker, then cut out the letter using your pinking shears.

CUT OUT INTERIORS 

For letters that have interior shapes, like B, you have one more step to complete.

Using your fabric scissors, not your pinking shears, cut a thin slice through the base of the letter. 

Switch back to your pinking shears and cut out the bottom shape.  Repeat for the second shape.  Be sure to leave at least one connecting point in the letter. 

That's it!