My favorite drill to build confidence on short putts is easy to set up and only requires a ball and tee. Start by finding a 5ft putt that is slightly uphill and dead straight. Next, push the tee into the back of the hole so that the head of the tee is sticking out slightly and just below the lip of the cup. Start at 3ft away and hit putts with enough speed that the ball hits the head of the tee as it’s falling into the cup and gradually progress back out to 5ft as you get going. This will ensure you’re hitting the short putts with enough acceleration and authority to take away the desire to “guide” them into the cup.