Hubs don't make noise if they aren't turning. IE if you are sitting at a stop light and you hear metal on metal grinding, its not the hubs. The hub is the bearing assembly on which your wheel turns.
Hubs can be bought at autozone, oreilly's, napa, etc, or even junk yards for much cheaper. New assemblys, are around $160. At least they were when I bought mine. Removal is as easy as removing all of the brake components, unbolting the caliper brackets, removing the rotors, unplugging the abs sensor, and removing the 3 15mm bolts from the back side of the hub (4x4 models will be more difficult just because of the half shafts being in the way) then removing the hub. Usually you have to beat it out from the back side as its been in a long time, corrosion will have it tightly in place. Or you can beat on the front of it to loosen it up as well.
Its not hard, I changed one out in a hotel parking lot with a set of 3/8" sockets and a couple jack stands.