Things I would do differently if I were Jun:
1. Take control. Force Shinku to do as I wished.
2. When Hina Ichigo shows up, force Shinku to take the Rosa Mystica. Or do it myself.
3. Get involved. As a middle school student, I would be considerably larger than these dolls shaped like, well, dolls. I think I could take em.
4. Kill Suiseiseki upon first meeting her.
5. At this point, Shinku would be more or less submissive, and extremely powerful, so I'd just sit back and wait for Suigintou, Kanaria, Kira Kishou, and Souseiseki to show up and get annihilated.
6. When I meet Rozen, beat the shit out of him, and take the newly formed "Alice" as my new sex slave.