They are nicely labelled up so that bit is easy. Remove the glovebox to give you access to the big grommet in the bulkhead.
Just take your time and keep it as tidy as you can. James (Loomer) said my fitting handiwork wasn't bad but could have done better when I returned to MSD LOL

This loom makes a huge difference to the running voltage and much reduces voltage drop. When my fans kicked in there was hardly any voltage drop instead of the usual 1v!