If you have ears like mine, it is impossible to tell which wheel bearing is bad even with the windows rolled down. Some suggest jacking up the car and try moving the wheel in and out (6 and 12 o'clock) - any movement is bad.

Using an IR thermometer is not easy if the brakes have been used, but you can compare side to side readings at the center of the hubs. If the IR thermometer has a red pointer light, that is even better.

The rear hubs are easier to replace than the front, cheaper also. If you do not have the equipment and jack stands, any GOOD mechanic can do this job. The axle bolts require a lot of torque, both to remove and put back on.
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Keeping it running is better than buying new