Mazda 626 Heater Core Replacement??

I know this is in the wrong section, and I already posted this same thing in the mazda section, but I don't know if the Mazda section will be of any help. I have a friend that needs his heater core replaced and he's bringing it to me. I'm just asking any of the guys on here if they've worked on this car, or if they know of any online manuals that might help aid me or any tips for getting the dash out and stuff. Thanks

My brother has a mazda 626,
I posted a question on that site about a month ago & still no answer,
& I thought about posting one on here,but did'nt know if
everyone was going to crash on me!#!
but anywayz,I'm not too shore about that heater core,but my
brother has a book on it,
& if no one knows,I will post some info on here tomorrow.
GL