Be sure to practice slow tight maneuvers more generally - find an empty car park to drill figures of eight, circling, and weaving too. Get as comfortable as you can with managing the balance of the bike at low speed.

Once you've established that the turn is safe and committed to it, keep your eye on where you want to go (edit: i.e. look forward in the new direction, not down), don't get distracted. This will help with balance.