This perk instantly raises all SPECIAL attributes to 9, but will not lower attributes which are already at 10. If the bobblehead for an attribute has been collected before taking this perk and the attribute is below 10, then it becomes impossible to raise it to 10 by normal means. On the other hand, if the bobblehead is collected after taking this perk, then the attribute will be raised to 10.
If the Lucky 8-ball is in the inventory upon taking this perk, then the player's Luck will be reduced to 8 when the ball is dropped. If one plans on getting this perk after finding the 8-ball, then it needs to be removed from the inventory beforehand.
If, from the moment of starting the game, it is planned to get this perk, one should not acquire the bobbleheads for the S.P.E.C.I.A.L. stats until raising those stats to 9.
However, there are 'work-arounds' for bobbleheads, such as the Luck bobblehead, which can be taken early if picking up the Lucky 8 ball after taking the perk. The Strength or Perception bobbleheads can also be worked around when doing the Those!quest correctly for the Ant Sight or Ant Might perks. Also, any S.P.E.C.I.A.L. stat that is already at 9 can be upped prior to receiving this perk without risk. This is especially handy if intending to destroy Megaton, as that is where the Strength bobblehead is found.
With this perk and enough skill books or high intelligence, it is possible to obtain perfect stats.