Just don't forget as the dizzy goes back in the rotor will turn due to the screw, just make a not of where it is when it comes out and start from there or may need a few tries, but easy to do, put a bit of grease on the new seal and it will slide in/out easier if you need to relocate it a few times.
Whilst dizzy is out check your phase sensor wiring as the oe ones become brittle and fall to bits!!
tabetha