Two additional steps I've learned of since doing this tutorial:
- To avoid damaging the shirt, and to completely eliminate the tendency for the bleach to eventually eat holes, you need to chemically cancel the bleach right after you're done bleaching it. The easiest way to do this is soak the garmet in Hydrogent Peroxide (the 3% kind they sell for disinfectant is perfect, I use three 88 cent bottles quart from walmart.). Be careful to keep your hydrogen peroxide in a dark opaque container, though, as direct sunlight and other UV sources causes it to break down.
- If you use a fabric pen to touch up portions of the shirt, you will need to heat set the ink to make it survive a wash. The easiest way to do this for most dyes is to iron it as hot as you can without scorching the shirt.
Hope that helps, keep any additional questions coming!