I don't know how to 'ride' without my reins (turning and stopping mostly) any tips to help combat this?

Legs and seat! Squeeze with the leg opposit to the rain you would pull to turn and sit back to halt
Use your seat! To slow down or stop, sit up and back and close your thighs gradually. For turning put on your inside leg and outside seatbone and a well schooled horse will bend around your leg. Hope I could help! :)
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