Sure have - several times. First time, I had NAPA replace the bearings in the pulley; cost, about $25. Within about six months those bearings grenaded taking out the belt as well. A new pulley at Autozone was $16 (they're a bit more now), with bearings . About a year ago the tensioner arm began wobbling (not just moving in an arc inline with the belt, but moving in and out also), so I replaced the tensioner for about $55 at Autozone. I now keep a spare pulley in the toolbox too, as they're most likely to go when I'm far from home.
Here's what I've learned: To remove the pulley, use a 3/8" 15mm short socket and a piece of 3/4" pipe as a cheater. The pulley itself has reverse threads, so step A is to stand on a bench in front of truck and with the ratchet set on "undo", rotate the wrench from 1:00 to 10:00 and while holding on securely to the cheater, pull the belt out of the way. Gently release the tension on the wrench back to 1:00, flip it to "tighten," and remove the bolt from the center of the pulley (remember, they're reverse threads). If you're just replacing the pulley, reinstallation is the reverse of the above. Replacement of the tensioner is pretty straightforward, if you're doing that too. Keep your mug out of the path of the cheater. Have fun.