Don't feel bad about messing up the brakes. It happens. Everyone that has turned a wrench has screwed something up at some point or another.
It sounds like warped rotors, but there are a few ways to check.
Here are some options.
1) Pull the rotors and have them tested on a machine at the auto parts store.
2) Jack the front up, turn the wheel all the way, and have someone spin the wheel by hand. Position something rigid to slightly scrap against the inner side of the rotor, and see if its constant, or if it goes scrape, scrape, scrape.
3) Go to a large parking lot, and drive strait - check for wobble. Turn 45 degrees, and check for wobble, turn 45 degrees, and check for wobble, etc. Basically you draw a huge box with your truck in the parking lot. If the pulsation increases or decreased at different points in this test, then you have 2 bent rotors. The test changes the orientation of the wobbles to each other. In some orientations, the wobbles fight each other, and in the other orientations, the wobble work together so that you feel them less.
Of the 3 options, I recommend #3.
However, I'm sure there are other options available that someone can suggest.