Trying replace just the bearings is nearly impossible because the ford hubs are a sealed one piece design. The hub assemblies are fairly easy to replace. Pull the tire, brake caliper, brake rotor off. Remove the wheel speed sensor from the hub housing held in with a allen head bolt. Remove the cover and stub shaft nut that holds the cv axle in the hub. You'll probably have to tap on the cv snub with a hammer to free it so it will slide out when you remove the hub. Remove the four hub bolts from the back of the knuckle and it should pop free with a hammer and some penetrating lube if needed. It helps to remove the outer tie rod end so that you can swing the suspensions forward and back to get to all the bolts.
Generally a hub bearing is easy to diagnos by loading the suspect side of the vehicle up and listening to see if the noise gets worse. So, if its right side bearing, make a some what long hard left turn to load the right side and see if the noise gets worse. If so 99% time it's a wheel bearing/hub.