Well, I really think it all went well. I pulled the truck in the garage yesterday about 2pm. Had it apart, heater box out, cleaned everything, put new core in, put box back, and hung the dash back to the firewall with a couple of the top screws before I stopped for the night and did all that by 8:30pm by myself. The worse part was the truck was all wet from it rain outside and got my garage floor wet so I had to kneel in it a few times. This morning I started on it about 10am and finished at 1:30pm.
Heat seems to be working great. Recharged the A/C today that all seems to be good.
If you have mechanical skills, some basic tools.. Screw drivers, metric 3/8 sockets, standard 1/4" drive sockets, a cordless drill with a 5/16 driver helps taking the box apart.. about 20 screw. and the A/C connector release tool One 1/2" and one 5/8".
As you will see in the pics I didn't drain my coolant system. I took some vise grips and clampped the heater hoses to minimize the lose of antifreeze. When done just added a little coolant and burped it to get the air out.
Now, with 95500 miles on my truck, I just hope it last and nothing major goes wrong with it.
The pictures are in order from start to finish.