'How to edit template' Tutorial?

[horse_cats]

So far ive posted a few questions and had some great responses
(thanks for that :))

However, strangely (maybe im blind or something) I can't seem to find any sort of tutorial on how to edit templates myself.

I'm the type of person who comes up with new ideas pretty often and hands on , so I don't really want to be in a situation where I have to pay and wait for the product every time.



EDIT:
OK, Ive just about got the hang of it, so never mind ^_^
But still, it would be good if this gets answered (for future reference for new users who want to edit the templates aswell):)