Have you had reptiles before? Honestly I love boas, and think they are great snakes for beginner-intermediate herpers who have at least some reptile experience, or are willing to educate themselves properly. Boas, especially centrals will grow much slower than you think. I have 4.5 year old female Colombians that are just now moving past the 6 foot mark. Boa growth rate gives you time to adjust to your animal, and grow alongside it, learning more as you go. Dont be intimidated by their adult size. The internet is filled with pictures of 9 ft monster boas, but most of these are power-fed and severely unhealthy individuals.
Slow growth is the key for a long and healthy life. If you can maintain a good 90 deg/80 deg warm/cool side, with ambient temps at least in the high 70s, and 50-60% humidity you are good to go. Boas are usually very hardy animals, and not prone to stress like BPs.