I have put 6 to the front, and 3 to the rear (for now) - as that's roughly where it was before.
Once i can get it into the workshop, on the ramps, I'll set it all up properly.
If you are just replacing the shims, then what you have now is as good a starting place as any, but in my case, everything has been replaced, so it all needs setting.
There is a 'correct' order for setting things up - ride height (different for setting up than 'running'), castor, camber and tracking (toe-in) - then re-check them all, then reset ride height to where it needs to be.
Then do the rear toe-in.
None of it is very difficult to do, and as long as you have a flat surface to work on, all you actually need is a piece of string, a spirit level and an accurate ruler (but it is quicker and easier if you use a camber guage).
The trick is to acurately measure what you already have, then work out what needs to go where to get to the measurements as per the manual. (relevant pages are produced below as a composite document).