If you really dye your own yarn you have to wind your wool afterwards.
That can take quite some time (I speak from my own experience) and so a self-made ball winder would perhaps be of help ;-)
Links:
Home Made Ball Winder
Note: I had to fill in a captcha (a form field to enter a distorted text) before I could see the entry.
Here at unikatissima:
Yarn Dying