Since I've decided to use 
this lovely layout by 
tessisamess as my default RP journal theme on dreamwidth, I've made myself a little guide to installing the version I customized. This is for my personal use, but left unlocked so that I can refer to it while logged into new journals and such.
Installing Complete Style from IJ- Go to Your Layers.
 - Under create top-level layer, select type: layout and version: 1 then choose create.
 - Click Edit next to the newly-created layer.
 - Delete what appears in the editor and replace it with the following (Complete Style from insanejournal, fixed to support reading pages):
 - Click Save & Compile, at the very top.
 - Wait a moment for it to finish, then click Back to layers list beside it.
 - Go to Customize and choose Your Custom Layers. Select Apply Theme under the one labelled Complete Style
 - Go to Customize Your Theme and fill out according to the guide below.
 
( Click for the rest. )