There is nothing to be fearful of. Just start outdoors on level clean ground next to some sort of railing.
Get yourself up on it and start working your way down the railing. It does take time to learn your balance, but all of a sudden you ride 5 feet then 10 feet and the next thing you know you are cruising down the road.
I have been riding one for about 28 years and my daughter learned to ride one when she was around 11 or 12 yrs old.
Good luck.
Ps. There are a lot of places on the internet that give you tips and the different stages of learning to ride!