Arabians in and of themselves are one of the most spirited breeds there are, and having worked with and handled so many Arabs, and a few studs, they are certainly not the calmest there is! That's not to say they are mean, or so hystrung you can't handle them, but I would prefer to work with a QH stallion than an Arab, if I had to choose between the two.
I would recommend, especially, if you don't have prior experience with a stallion, that you keep looking; find another gelding, or a mare. Stallions, no matter how calm they are, should not be handled by those who are inexperienced in how to handle them, and certainly one who is not experienced in dealing with a stud should not own one, especially if they are going to be riding where they may encounter mares in heat; no matter how calm the stud, that can all go out the window if there is a mare in the vicinity.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."