Yeah, it's easy as that. These LEDs are set up to work with a 12 volt system, and draw little power, so pretty much plug and play. On my '07 Sport, it didn't come with the foot well lights, but the wiring is already there.. so all you have to do is tap into it and it works like factory.
Doing the puddle lamps are a little annoying, because you have to feed the wires through the door harness, take off the door panel and take off the mirror. A little time consuming. But not terrible. The only thing I would do differently is add another light to the inside of the door facing down, or at the bottom of the door. The LED on the mirror produces great light when you're getting into the truck. But when you're getting out, the light is on the outside, it doesn't illuminate where you will actually be stepping. Enough ambient light comes from the dome light so its not terrible, but while you're running wires and have the door panel off, might as well do it all at once.

Any other questions, let me know!