Small opening is a good idea, also nearly square to the tip, not on an angle as shown helps. Keep moving, squeeze lightly, nearly perpendicular to the work. Once you get into smearing it with your finger or some other object, it's just that, smeared. 6 to 8 inches a second is a good speed to learn to caulk like a pro. Not too much coffee first is also a good tip. Try to use a gun that stops squirting when you let go of the trigger. Not one of those guns with the tab you need to press to release. If the tube keeps dribbling when you stop, lightly crush the tube, crinkle the cardboard if that's what it's made of. Your trying to make the tube a bit more relaxed.