If you still have the stock cats?
Look in here and be warned about the famous demon bolts.
Demon Bolts
There really isn't a DIY since it pretty straight forward.
I suggest carefully removing your stock or aftermarket intakes so you have plenty of room to see where you're attaching the socket with looooooong extensions.
Carefully remove the o2 sensors, cats brace, intakes, loosen the front demon bolts and rear bolts.
Have FUN!