Yes, you do need to pull the timing belt off and behind that is the engine's front cover which the front main seal fits into.
It is easier to remove the front cover to get out the old seal but that also requires loosening the oil pan.
If you do take off the front cover then it needs to be aligned again so it is centered on the crank , if this wasn't done originally then that may be why the seal is leaking now.
If I remember correctly you put the front cover back in place, with all it's bolts in, but loose.
The alignment tool fits on over the crank and thru the hole in front cover, no seal in yet.
This centers the cover with crank, then you tighten up and torque down the front cover
So a bit of work.