troubleshooting Question

AD Forest Level Upgrade Procedure 2003>2012R2

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GGHC asked on
Active Directory* domain controller
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We are in the process of upgrading our single domain forest from 2003 to 2012R2. We have several site- (On=On-Prem and AWS)

Currently we have all 2008 Domain Controllers in a 2003 Forest Level. We ran Forest Prep already.  Once forest level is raised I will run DCDiag to make sure all looks good.

Once on 2008 Forest level, can I promote a 2012R2 server to Domain Controller?
Once on the DC role is on a 2012KR2, can the forest level be upgraded to 2012R2 from 2008?
Is there any Forest preps that needs to be done in between?
Any one know of any "Gotcha" during this process?
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