If the subject is there willingly, a Gnosis roll is performed gainst the subject's willpower. Each success takes away one from the subject's willpower (for the duration of the ritual).
If the subject is there against her will, a Gnosis roll is performed against the subject's willpower in a resisted roll (her Willpower is rolled against your groups average Gnosis rating). The group needs to overcome her willpower before you may continue.
Each Gnosis roll counts for one hour of game time. When the subject's willpower is overcome, the number of continued successes indicate the intensity of the driving goal.
(i.e. Three Stranger Attractors are trying to imbue Samantha Red-Talon with a driving goal to seek out and destroy all wildlife poachers. They are doing this against her will. Samantha has a Willpower of 5, the combined Gnosis of the group is 16. Samamtha rolls 2 successes against an average Gnosis rating of 5. The Strange attractors rolled 4 successes. Samantha loses 2 Willpower point (for the ritual). she rolls again (three dice this time) getting 1 success. The S.A. roll a phenomenal 4 successes. This allows them to imbue a driving goal (flaw level -2) into her, after two hours of ritual.)
If the totem spirit does not approve of the driving goal, the totem's gnosis is added to the subject's Willpower dice pool.