Got to pull the half shaft. To do that I would recommend removing the knuckle and half shaft as an assembly. Then you pop out the old seal and tap in a new one and reassemble the whole mess.
So you remove the wheel.
Remove the brake caliper (no need to unhook brake line just hang it out of the way.
Disconnect the ABS Sensor and hang out of the way (just the bolt holding the sensor bracket to the diff.)
Undo the three bolts holding in the knuckle.
While supporting the weight of the assembly use a large screw driver or pry and pop out the halfshaft from the diff. (should buy a new circlip for the end of the halfshaft.)
Pull the seal and reinstall it all in order.