I tried something similar once, trying to get from the 6-12 to the 20-40. I got to the casino and realized I didnt bring much money, didn't want to go to the ATM until I had to. Started with $60 at the 6-12(the minimum buy-in) and moved to the 9-18 with about $180. I finally got to the 15-30 with around $280 but lost it all there. I was all-in a couple times but won the hands. It was pretty damn fun.