oh god, sorry, you really wanted to know! Sorry!
Ok, here's what you do. This is the simplest and easiest way. There are fancy ways to do it. I'm sure someone who buys Noro or suchlike fancy yarns will enlighten you
This is perfectly adequate for dying, IME.
Sit on the floor. Put your feet out, around 18 inches apart, doesn't really matter. Wrap the beginning of your yarn round your big toe (it helps to take your socks off). Now wind it round and round your two feet until you have no wool left. Then stop. Tie the very end bit of the wool round the skein. Take your feet out very carefully.
Then get 8 short bits of wool, around 20 cm max, in a different colour is good, acrylic is especially good as it won't dye, then tie them at equidistant points round your skein.
Then dye it.
To wind it back into a ball after you have dyed it, repeat the process backwards, ie put your feet into the skein, hold it taut, cut the short bits of acrylic (throw them far, far away, they will only get tangled) and then find the end bit of the wool where you tied it. Untie it. Then just wind it back into a ball. So long as you keep it taut, it should be fine, unless it is either tangled or very fine.
hth.