The swing will start easy and will increase as you are transmitting the weight and twist the hips. This is a good tactic as it gives you time to evaluate the space and when the speed needs to be increased.
Explanation:
You shouldn’t interrupt your swing at any point, as it will result in decreasing the speed. In the beginning, it will be hard and maybe result in giving all your power trough the bat but as you are making progress, your top hand will necessarily let go of the bat.