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Another way is to jack up (and support) the car, then attempt to shake the wheel. Hold it at top and bottom and try and shake it vertically, then repeat horizontally. There should be very little, if any, play in it. As Dude318is says, a grainy feeling when rotating is another way to tell.

Easy way to check is remove each wheel, and rotate the disc. If you can remove the disc as well to get closer to the hub that would be even better. If the bearing rotates but not smoothly (i.e. having a sandy/grainy feeling) then that is likely the culprit. This is how I was able to track down a worn rear wheel bearing on my car.

Noise from the strain of the power steering pump can cavitate (or 'reverberate' is probably more accurate) through lines and even to the steering wheel itself. Check fluid levels, and pump condition. If it all checks out it may just be normal. Typically bearings will not seize when they are already in motion. They can fail catastrophically, but it is ...

You lube the bearings until all the old grease is out. Can't really tell if 14oz is enough, but if using one of those fancy repackers, it might be. If replacing all together, just make sure there is enough grease in them. Some come pre-greased, but I would repack anyways. Can never really tell how long they been sitting in a parts room.