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Lunges can be more challenging for some and they do take time to master. Take your time to practice the move slowly and with the help of a family member if you need assistance lowering yourself down. Once comfortable continue to an unaided lunge. If you feel uncomfortable or insecure in the movement then try an different exercise.
Stand in a split stance with your right leg forward and left leg back.
Slowly bend the knees, lowering into a lunge until the right leg is nearly at a right angle. Keeping the weight on your heels, push back up to the starting position. Keep your back straight and don’t let your knees extend over your toes.