Assuming your is the same the hand brake is operated on the drums in the disc hub so using the normal brakes shouldn’t be affected by leaving the hand brake on.
Only had squealing brakes the once when we first got it and that was sorted with cleaning the calipers, pad carriers and pins then using Ceratec grease on reassembling
Squealing is usually the vibration of the pads as it doesn’t make even contact with the disc. If the weren’t squealing before and your not down to bare metal then it’s probably dirt build up preventing the pads from moving freely.
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