3 inch body lift on 98 Wrangler?

I was wondering how difficult it would be to install a 3 inch body lift on my wrangler I already have a 4 Inch suspension lift on it and was going to get the extra 3 so i could clear my new tires......I just need to know how difficult is it, do i have to modify anything and so forth.
Update: No i'm very mechanically inclined i have just never experimented with body lifts before, How much harder would it be then the suspension lift (It was pretty easy for just me and my father)
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