I like swimming especially the backstroke style though i do not do it professionally.
I like to swim. I don't do it much but I like it. Have never tried the backstroke style. Is it hard?
It is not hard. especially those who fear not being able to breath, backstroke is the best
It just seems like figuring out how to move your arms would be weird. They go the opposite way compared to regular swimming, right?
Yes needs practice. The other downside is you do not see where you are going
That really seems hard. How would you know when or where to stop? lol
It is a long axis strong and you swim with your eyes open so with regular practice, you get used to the stopping point. 
Could be interesting to try. I might one day. Would need to find someone to show me, though. Did you teach yourself?