I used a drill and put holes all the way around with extra holes at the cool end of the rubbermaid. If you are careful and patient the burring should be minimal and you can smooth them out with a nail file. For the love of Pete make sure the tops are secure. When I brought home my boa she escaped the first night due to the top not being adequately secured.
Common sense, the least common of all senses
0.1 BCI 2.2 balls