This grip is not hard to replace at all but what the dealers do not tell you is that you will have to cut the stock grips since the Rizoma's are shorter that the stock Ducati grips and if you don't cut them, you will see a small gap or space between the bar end and end of the Rizoma grip.
I had them done by a friend who had a lathe and he cut them straight. If you do them and decide to cut, make sure your clip ons are securely held in place and your cut is dead on at 90 degrees.
Also, if you have big hands (I don't), this set up will leave you with a shorter overall grip and your hand will be hitting the fairing when moving the bike around in the garage or when parking it where lock to lock movements are required.