When you practice you want to make sure that 1) you are practicing the right moves and 2) that you are grooving a consistent swing that you can take to the golf course.
You want your swing to become automatic like spelling your name. When was the last time you spelled your name? You probably can’t remember because it is automatic, you do it without thought. Why can’t swinging a golf club be the same way. Why can’t we make a smooth swing without any thought every single time. Well, that is because this game is really hard, even pros don’t make a perfect swing every single time. But they are consistent and that is because they have practiced enough that it has become automatic.
One way to get a more automatic swing is to do drills and exercises. When you repeat drills, you ingrain the feelings and you improve faster. When you do drills, making several repetitions, your muscles start to get feel and you don’t have to think so much.
Here is a drill to help your downswing.