Step 1: Gather Materials
The materials I used are as follows:
Large mirror (I purchased mine at Wal-Mart, they had many cheap and decent looking ones)
Armour Etch (found mine at etchworld.com)
Foam paint brushes
Contact paper (kitchen section at Wal-Mart)
Step 2: Preparation
Next, I measured the "body" of my letters (feel free to correct my letter terminology). By "body," I mean the distance from the line the letters are written on to the tops of the main parts of the letters. For example, the lowercase "o" fills the distance I measured. In my font's case, it was 32mm. Then, I measured the distance the "tails" stretched from the top and bottom of the letters. For example, a "y" has a tail that hangs down, and letters like f, t, and h have tops that rise above the main line. For my font, the top and bottom each extended 10mm above and below my main font line.
Knowing this gave me a knowledge necessary to properly align my font (though the pictures still show I didn't quite get it perfect).
I gave each line of text 52mm of space to ensure that it would not run into the letters above or below it. My pictures show the lines that I used to align my text.