Short and sweet today.
Go to the range and hit four 8-irons. Did you get similar-looking shots? They all had nice ball flight, and went where you were aimed? Didn’t hit any of them fat?
Good. We’ll call those shots Pretty Much the Same.
On to part two.
Hit four drivers. Did they all go Pretty Much the Same like your 8-iron shots did? Even two of them? No?
If not, if every one of them was different, then you shouldn’t be hitting your driver.
Start with your 9-iron and work your way through your bag, one club at a time, hitting four balls with each club. The longest club with which you can hit three out of four shots Pretty Much the Same (and straight) is the longest club you should be using off the tee.
End of lesson.