How to perfectly align multicolor HTV letters

Do you want to create an iron-on vinyl projects with multicolored letters? Here's how to perfectly align and apply rainbow vinyl letters to your project.
I used this technique to make back to school shirts for my kids, with their grade number appearing in various colors of iron-on vinyl.
(commissioned links) for the products used in this video:
bundle pack of multicolored HTV (iron-on vinyl): amzn.to/2YZTc83
little's girl's plain white t-shirt (runs small): amzn.to/2YXjko1
Fonts Used:
-Impact
-Black Jack