OMG! i feel like such an idiot. Sorry to waste your time. I got caught up in all the Mapsource/Mapinstall/Gmaptool information making it much harder than it had to be. After reading your advice again it all became clear, and everything was successful with the install.
One question I would like to ask is what are the advancements/improvements of the Garmin mobile XT 5.00.60 in the guide as compared to the 5.00.20w I am running on my phone currently?