..Just realised that that wasn't very helpful. >.<
I think you need quite good balance, or else you might feel a bit insecure. Though I think it's pretty hard to fall off because if you feel youself going you can stick your knee up under the lower stick-outy bit (it probably has a name.
) You have to carry your hands very high because your leg is in the way but you get used to it. It's really fun though, you feel all ladylike. :P
I think you should try it before buy it, you might not like it. It'll be a strange experience for your horse too (unless they've been in one before) so be sure and be careful with how you introduce it.
Well.. good luck. (: ..and sorry for the double post.