Hi, the sicilian is a sharp opening and requires a lot more studing then other openings as every move is decisive you must make a good move all the time.
On the other side your opponent have to make the best move all the time too or he will be in big trouble specially if you know how to punish him.
Sicilian is a great opening for the theory fans, you have to follow theory and have to create your own improvements. If you study the position very very well you dont need nerves of steel, you know what is going on and with great chance you had the complicated positions already analysed at home with computer help.
i've always admired people that can play the various Sicilian variations well. I've got the book the Sicilian, Soltis variation....it takes nerves of steel, games come down to a tempo!!! I'm not ready yet. I guess, when the student is ready, the opening will come grasshopper!!!