Changing fork oil / Head bearings

[Bliker]

Any tricks to changing the fork oil on the  04 Tiger? From what I understand the forks have to come off to dump the oil out. How about adding the oil, do you have to be careful to avoid getting air in the system or just pour it in and seal it up.
  I'm thinking I might as well grease the head bearings while I'm at it. Do I need any special wrench to get at the head bearings?

[Stretch]

Fork oil:  http://tigertriple.com/forum/index.php/topic,2966

Head bearings:  http://tigertriple.com/forum/index.php/topic,3344

The head bearings are serviced by using a pair of spanners (size unknown to me), Triumph Part # 3880140-T0301