Practicing item techs in training mode with Mr. Saturn seem to work well. Once you learn how to use items, z-drop, instant catch, glide toss, jump cancelled toss, etc etc, then you play matches and try to apply these to your game.
Remember not to force the item game into your general strategy, but to use the items as an extension of your other options. Basically, what I'm saying is that don't throw the piece at the enemy if something else will work better.
Remember not to force the item game into your general strategy, but to use the items as an extension of your other options. Basically, what I'm saying is that don't throw the piece at the enemy if something else will work better.