I learned in a narrow hallway where I could hold onto both walls and pedal. once you get comfortable, you can find one wall, to start on, and then see how far you can go. The hardest part of unicycling for me was the initial getting on and starting, so if you start holding onto something, it is much easier. eventually you can push off of the wall and see how far you can go on your own, gradually increasing the distance over time. It will take you a month or so of practice. The initial concern is definitly falling back on your head, but this will pretty much never happen because you can just jump off whenever you start to lose your balance. over time you can learn how to ride backwards, jump and stuff like that. It's super fun.