Step 1: Gather Materials
Materials to be dyed. These should be primarily of silk or cotton, or an animal or plant based fibre. Not all of these dye equally, so be prepared to experiment.
Tea. It can be any kind, as long as it primarily contains tea leaves. If you have something old lying around, but hate drinking tea, now's your chance to get rid of it. Coffee will also work, and you can use coffee grounds that have already been brewed. It gives browner colours than tea. If you do use coffee grounds, makes sure to tie them up in a loose woven cotton like cheese cloth, or double layer of nylon tulle so you don't have to pick the grounds out of your dyed material.
Boiling hot water. Don't burn yourself.
A bowl or vessel to hold your materials being dyed and the tea/coffee grounds to dye them with. Make sure there's enough room for your materials to move around freely without the hot water spilling.