I played in a team match play tournament after day 4 and had some of the best mid- and long-iron shots that I could remember to that point. I lost my match 2&1 but not without putting up a good fight. I found that the body movements helped me work out some sequence issues and bring more power and ground forces into the shot. All depends where you are on your golfing journey. Some people the changes are so drastic that it can be a real disruption. For me, the first chapter helped fine tune my body action.
Go to the range sometime this week before your game on the weekend and just get a gauge on whether or not you can hit the ball decently under some pressure.