Noooo, there's no need to open it up to bed it in? Wtf?
Just flush it clean with some GT-85, and ride it, ride it like just a normal bike, no trials use for 1 or 2 hours and it should be fine. Do NOT just go out and ride your bike like normal (I mean riding trials) just ride it chill. And flush it out atleast like 3-4 times during the "normal riding".
You will see a shitload of greese come out on the side of the freewheel, this is normal. I have had mine since the start of the year, recently changed to a SL though:)
Good luck:)