You shouldn't install RadsAtom or DestroyBarricades.
Before doing this, close any DemonBuddy window you might have open.
Download GilesTrinity (i use v1.7.2.4 as linked in the main post), unzip it, and put that folder in the "Plugins" folder in DB.
So the corret folder path should be: "DBFolder\Plugins\GilesTrinity\" and in there you should have loads of folders and files. Don't touch those.
Now download "Trinity Routine v1.1", also linked in the main post. Also unzip that and put the folder in the "Routines" folder. As default in a fresh DemonBuddy install there will already be 2 folders named "Belphegor" and "Generic". The third one will be Trinity after you copy-paste it in there. Done with that.
Now download the Galkaizer V4 profile (linked in the main topic), and unzip it.
Make a new folder (if you don't have it already) in the DemonBuddy folder named "Profiles" and then another folder inside the "Profiles" folder named "Galkaizer V4". Now copy-paste all the files you unzipped earlier into that folder.
Now start DemonBuddy up and log in, go into "Plugins" and click on Trinity and click Config. Now you should configure Trinity the way you want it to run, items to pick up, etc etc. Click "Save Settings" and it'll close.
Now just open Diablo 3 and load the "Galkaizer v4.xml" file and it should run.
Mine is going at 400-450k GPH and 38-42m Exp/Hour at the moment, it's awesome