I have done this crossing loads of times , having a cabin is a very good idea as often there is nowhere to sit comfortably in the main part of the ship. There is also loads to do and see on the ship and even a cinema if you are inclined . Take sturgeron and eat regularly (small amounts) . I only had one crossing which was a little rocky but that was in winter , mostly after the first 15 mins or so you don`t feel any movement just a gentle buzzing under your feet . It is quite enjoyable so try not to worry .
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I know you fly over water in an aeroplane, but it's not for so long. Can anyone tell me it will be ok?
Or not, as the case may be.