What do I need to do to fit 33s

Hey y'all. I have a 2000 xj and am wanting to throw some 33s on using my existing 15" rims. I have a 2" lift kit on now so I know I need more. My Q is what would I need to do to get 33s on ? Eg- how much more lift would I need and would I need to do anything to my suspension or steering etc...? Thanks I'm advance guys.