Your best bet is to engage TRIPOD mode which will slow the movements right down and is perfect for indoor flying. Start up the drone’s props, then tap the remote icon on your phone screen on the left of the display; this opens up the Intelligent Flight Modes and TRIPOD is on the right. This is your best mode inside.
You may also consider turning off the obstacle avoidance sensors as they may go off too often inside, but of course you’re far more likely to actually hit something inside.
My advice? Practice by your self; no pressure with no one watching and get used to how the controls work when the drone is not facing you. If the drone is facing you, the controls are reversed (left becomes right; fwds becomes back etc) and any other orientation will confuse things even more. You also run the risk of intermittent GPS which can cause unexpected movement as it re-locks onto a flaky GPS signal.
Cheers
Ian