It's just hard for people to judge how much prior knowledge is expected of them when they spot "manual", and unfortunately "more than I know - forget it" is probably a common guess (maybe this could be addressed in the thread title?).
I believe the term you are looking for is "Walkthrough". Usually involves pictures with red circles and arrows drawn at appropriate spots, and clear, numbered directions. Someone's gotta put another one of those up. I might next week if no one else feels inclined.
PS Protip: if someone does a walkthrough, remember, in MS Paint, if you click the button to draw a circle or an arrow, when you go to draw it over the picture, holding the shift key is your friend
EDIT: Matth, the Installer we had actually installed quite a few mods (BP, Derelict, a slew (20?) of others) -- this was because it was rather easy to set up the installer to also download your mod. BtRL also used the Installer, as it was customizable enough to allow you to use it for your own TC.