My two cents:
1. If you are worried about escaping, you probably have the wrong enclosure.
2. From everything I've read, a GOOD thermostat (such as the Herpstat) and a temp gun are essential, top of the list items. (So, there is guy somewhere who has maintained a healthy collection without these tools for the past 30 yrs...doesn't matter - most of us are not him.)
3. For any new animal I recommend a getting a good book. It will have all the information in one place. IMO, Vincent Russo's The Complete Boa Constrictor would be worth the expense if you decide on a Boa.