The snap cap drill is good advice.
I have never shot at a correction chart (if you mean one of those target-like charts that tell you what you did when a shot goes to a particular place on a target) but I keep them around at a range that I supervise so that shooters can use them for analysis.
If you are a new shooter, notice when you analyze a correction chart how much happens because of very small movements of the hand/fingers. When you move your trigger finger, those three fingers below want desperately to move in sympathy. Small motor movements. Very subtle stuff.
Pete