wheel bearing pside front, how to get to it Options

[PolliS_5S-FE]

hi there guys, ive been told i have a bad wheel bearing so, im just wondering how 2 get 2 it. I have the car up and the front p side wheel off. then i come 2 this odd shaped nut with like 20 teeth and a clip on it (splitpin?) which im unsure how to remove, i dont wanna just plow ahead and get it off the wrong way.

also with the wheel bearing I understand that ill have to get it hydrolicly (sp) popped out and pressed in? and auto shop should be able 2 do this right?

cheers lads any help much appreciated.