Choose your side. Your Force Powers will diminish with use, so use them wisely. A GAME Switch to third person and enable Always Run during saber duels with the bosses. You may find it easier to beat Pic in first person, however, because he's so short. Most of the bosses can be defeated by running at them and then stepping to one side as you slash them, or by jumping over them and spinning, striking, and jumping away quickly.
Standing still is death.