See?? Work your way up!!! Cresties, chewies, leachies, Komodo dragons!
I'd give 6 years just to the cresties though, before you expand to the larger, more difficult species. Even though they're all the same family, make your mistakes with the smaller, less expensive ones...and EVERYONE makes a few mistakes.
Just going from snakes to geckos is a BIG leap.
Learn to crawl before you try to RUN.