Benefits Self-Service Enrollment for Pre-hires and new hires

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We are trying to shorten the lead time when a new hire is enrolled in benefits.

To quickly summarize:  Candidates will be imported from Taleo to HCM Cloud.  We would like the employees to enroll in self-service benefits prior to day 1.

What do other businesses do?  Have you found a way for pre-employees to log into self-service and enroll for benefits?  Is this process completed in Taleo or directly in HCM Cloud.