Murdered Silverado

I've went to a place to check out my 3 inch body lift and get it removed and they want almost $1500 to do it. I was wondering how hard it actually is to take off I own a 2011 silverado and I'm going to set it back to level and on stock tires but I wanted to get the 3 Inches off so it doesn't look like tiny tires. I'm also selling the tires the are 325/65/18 (only 3k miles), the rims they are 18 inch rockstars and possibly my fender flares they are painted black.