How do you remove the large idler pulley just below the AC compressor on a 98 GMC Surburban?

The pulley directly below the compressor is the Power Steering pump, not an idler. It requires the use of a special GM power steering pully puller, usally available to rent at good auto part stores. The Idlers are the one between the alternator and a/c and the spring loaded tensioner is just below the alternator, both just bolt on. Removing the upper 1/2 of radiator shroud helps access to the front of the egine.