Okay, well as long as you know the good stuff, like how often and how to properly change the water, cycling etc you should be fine. I've cycled my betta tanks with them inside, and all went well. Of course I was religious with my water changes throughout the cycle period. Just make sure the water is the same temp and is dechlorinated. It also helps to age it a few days if possible before using it.
Bettas are weird fish. Their behavior is erratic and odd at times. I currently have five males and three females. Each one of them is totally different in personality, and all of them exhibit constant changes in character from hour to hour. Sometimes they'll hide, other times they'll swim all over like crazy.
My Yellow Gal seems like she's often deep in thought, and stares at me incessantly. My male crown tail hides and sleeps on beds of moss. Master Betta swims back and forth across the front glass night and day. Red Boy wanders aimlessly, but always comes to the front when he sees anyone come in the room.
All have been healthy and easy to care for. Good luck with yours and welcome to the dorky yet wonderful world of fishkeeping. Only be careful, I started with one ten gallon tank and I now have a 55, a 10, a 20L, a 40, 2 2.5s and a five. Plus three bowls for other bettas. All within three years.