Don't worry. You'll get lots and lots of practice. Be sure to feel the fans with your fingers. Once nicked, they'll throw things off. Check the idler pulley from time to time as it can get nicked. I found going to a kevlar fractional hp v-belt resolved a lot, tightening the pivot joint of the idler pulley arm just in front of the engine after I was done also helped a lot, but you have to remember to loosen it if you have to do this again. I also put a second spring on the adjuster which helped a tiny bit (smaller and fit through the OE spring). Be sure you have the beefy brace... it's a warranty replacement if you don't. Mine came with one, but I can see how that would cause issues. On my SD, there was no need to remove anything but the spring to get the belt off or on. A friend watched a youtube video where he was supposed to take bolts off.
I have a 60" SD Raptor and my belt is 51 inches long, part number 6851. I
also find the Lisle 45100 spring tool invaluable in popping the spring onto the pulley arm hole.