The FNH owners manual, available on line, shows how to remove the trigger group in general.
I have not seen a video on how to replace the trigger on a FS2000 nor I am I aware - I may be out of the loop - of a trigger replacement being available.
There are some modifications that can me done to improve the feel of the trigger. I am late this morning or I would detail them. There are 3 that come to mind.
If interested, please PM me and I would be happy to respond a little latter.
Having posted all that, I suspect you want to know how to remove the hammer group.
Charge the weapon, make sure the gun is empty of ammo. Do not pull the trigger, hammer group will not come out, if the hammer is in the fired position.. Take the bottom of the butt pad pull away from stock and slide up, and off the gun. Grab the hammer group and pull it out.