Okay so here is the first of many novice questions.

How does one re-program the truck? Start to finish.
What is used to do it, and where do you get it? And/or the software to do it with?
Price?

Can anyone do it, or does it have to be by someone who knows the system?
If anyone can do it, Can you screw up the truck's so-called brain if you make a mistake?

What specific programs do you want to change or modify?
Engine horsepower? Limiter? Fuel efficiency? Diable Airbag system 'SRS', for off-roading? etc...