What is the process of replacing the heater core on a 1999 F150 Lariat, 4.6L 2WD SuperCab?

I'm basically starting from scratch here - I was a whiz at changing them out on my 1990 F150 (it was a snap), but have no experience with this model truck. I need all of the details you guys can give me.

Thanks for your help.

 

It's an all day job. The whole dash has to come out...

https://www.ford-trucks.com/lc/lc.ph...50_Exp_002.doc