[Paddlewise] Rolling

Hi,
Ive been here about a month and have seen all these messages about rolling 
and such.  For me, its out of the question as I paddle a sit on top kayak 
until I finish my Chesapeake 18.  I was wondering how hard is it to roll, and 
how do you go about doing it?  My guess is use the paddle to push you over 
while keeping your body pointed straight down, but I am probably wrong.  Also 
how long does it take one to acquire these skills?

Thanks for the info,
Tom
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