1997 Dodge 3500 Heater Core Replacement

I am needing to replace my heater core. I don't have the $600 to spend to get it done, but I do have the time to do it myself. Can anyone send me step-by-step directions on same or link to site that has directions? I understand that the dash has to come off...What a bummer, but am willing to do it. Your assistance is needed. Thanks.