Glad you like it :)
This challenge would work fine without editing, as it's mostly in your head and lots of the traits only affect things like confidence, strength etc.
If you want to go the extra mile...
Here's a thread with some useful links for editing (thanks again crazymcgee)
The easiest way to edit on a trait is to have another save open in notepad++ that already has a slave with the trait you want. So that you can copy paste the parts you need over.
The main parts that will need changing are "traits": and "effects": . If a trait affects obedience, courage etc and you really want those stat changes, you will need to manually change the relevant numbers.
It takes a bit of getting used to :S So long as you don't overwrite the original save, there's no harm in making a few mistakes though.
If you need more specific advice, just ask here or on the discord.
(Note: a modded save won't load from the main menu, only from the save menu in the mansion)