I change mine twice a year. I just drain the old fluid out of it by opening the bleeder and pushing the pedal down to the floor and holding it there. Then have the bleeder closed. I repeat this until I am just about out of fluid. Then I top it off and continue this process till I am almost out of fluid again. This way you don't pull any air into the system and you are flushing all the old stuff out of the system.
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1998 Formula M6 from A4 FTRA, Ported LS1 heads, LS6 Intake, PaceSetter LT, Catted - Y, Hooker Catback, 3.73 gears, LID, and UD pulley.
From the SVT Forum: "Okay, who fucked up and told the LS1 guys about KB?" | 
Changing Clutch Fluid 
