Step 1: The shirt, fit to be dyed!
Step 2: Presenting your choice of dyes
However, although I have used kits, I prefer to use the Procion dyes as supplied by Dharma Dye. They have a great website where you can buy all you need. http://www.dharmatrading.com/dyes/ Procion dyes are the best and brightest dyes, I thoroughly recommend them. However, if you mix the dye powder yourself, always wear a mask so that you don't inhale the powder into your lungs.