pulling dash on 89 trooper, also A/C

ok, I need to pull the heater core and am hoping some one can tell me it's not a big deal and that the dash will pop in and out like a snap together model. also, doesn't the nearly any part of the A/C system require special tool to dismantle. my original post is http://www.automotiveforums.com/vbulletin/showthread.php?t=366215
thanks