2012 Default Theme – Stuck! Adding Different Sidebars for each Category

Perhaps someone can help me with this as I’m stuck.

Theme: Default 2012 with Child
Homepage is a (Page)
6 Categories 10x posts each

I know this is possible but am not sure which is:
(a) The most reliable method
(b) exactly which code to use and
(c) which templates to insert the code into

Problem: Add a different sidebar to each of my six Categories so that each Post in that Category has that same sidebar.
The Home page will still use the default sidebar 1

Progress so far:
I have managed to register a new test sidebar in the functions.php which is now showing in the Widgets, so I think I have that part correct.

I believe I have to create a new sidebar.php file for each of my six categories yes? but this 2012 theme seems extra complicated and I have no idea where/how or which template to call them from.

Have looked at many tuts but many are half-assed, incomplete or very old and of course nobody seems to be doing it with the current 2012, thus I have become confused, please can someone enlighten me.

thanks 🙂