Integrated headset advice please

Need to replace Giant VT integrated headset (sounds/feels rough and has rust dripping out the bottom of it…), how do I go about this?
Can the bearing just be replaced?
Will I need specialist tools?

The current headset is the original FSA, only other markings are “45′ ACB”

This has been posted previosuly but no-one replied to it…
http://www.singletrackworld.com/forum/topic/fitting-an-integrated-headset#post-11055

No tools needed to fit or remove. Just take the old bearings out and replace with new ones.

cool, sounds too good to be true…

….. apart from crown race, you’ll need a tool to whack that off the forks if it needs replacing, but you shouldn’t need to replace it if you just get new bearings instead of a whole new headset.

have no issue with crown races, just never replaced a headset (internal or normal[?])

I’ve used WTB Innerpeace Cs and the Superstar ones on Giant Internal Fit headsets. Cheap and no issues.

Bonus… even better.