I think hr would be there as a "shared install", which as my learned colleague says will allow the minimum info to be set up. I do hope though that under a shared install you will be able to create a new business group - in other words, stay away from the Setup one! You will also find it beneficial to create KFF structures for grade, job etc - again, try and avoid using the seeded ones. From bad experiences with putting hr/payroll in after purchasing, the other big headache is likely to be around the lack of date-track capabilities - ie setting up a recruiter on a given date means their hire date is likely to be set up as that date.
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