If you can get the first mods to access the fire pan done, your life will be easier.
You want to fill 3/4 of the pan with unlit, and 1/4 lit.
Add boiling water to the water pan to start, and have a funnel to add boiling water when needed.
You will need to stir up the coals to make sure the bottom coals are burned as well. I used a wire hanger bent to stir them up. and push fresh ones across from the door.
I'm sure others have better ideas, but these are my $0.02.
Good luck, and post pics.
OTS, 18 1/2 WSM (Betty), iQue110, 30" MES