I'm not sure if I'm allowed to do this on this site, but here's a link of a guy who did it himself with instructions and pics. If you are out of warranty, this is an expensive job to pay for labor. Hope this helps.
HVAC Removal with Pictures - TDR Roundtable
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2003 graphite quad cab 4X4, nv5600, stock (except muffler & silencer ring gone), Line-X boxliner, 285 Toyo AT's.