As a heads up:

A hungry snake will accept f/t. A snake that JUST ate will accept live until it feels it can't eat any more. If you you want to do both on one sitting, f/t then live.

If you want to alternate regularly, make them hungry before offering f/t. If you're feeding on 7 days, wait 10 to offer f/t after feeding live. And SCENT THE ROOM. This can't be stressed enough. I just happened to walk into my bug room to feed my extra lesser and she was ready for the live, she hit it before it touched the ground. Took me 5 minutes for her to take her last f/t, and that was with 6 hours of it thawing and 10 minutes of it heating under a lamp.