How can I make my pull offs sound better?
A good practice regime is to play, say, top string fret5, hammer on to fret 6, pull-off to 5 again. Keep this going until each note is the same tone and volume, then change fingers - for both notes when it's good- and all without stopping a regular rhythm.
How do I pull-off correctly?
In its most basic sense, a pull-off is executed by striking the string and, while the note is ringing, releasing the fretting finger which allows the next note—an open string or note a finger further down the neck is holding—to sound.