Re-running noncdb_to_pdb.sql-12c

Hello Gurus,

I'm planning to upgrade our db's from 11203 to 12102 RAC (RHEL 6.1 64bit),the db's are very large in terabytes so the PDB's will be created with "nocopy" option.Is it possible to re-run the noncdb_to_pdb.sql without restoring if failed for whatever reason? and also,how can i speedup the conversion from noncdb to pdb its taking few hours.

Here is what i'm planning to do for upgrading from 11203 to 12102.

1)upgrade 11203 to 12102(non-cdb).

2)plug it in to CDB(create pluggable database nocopy).

3)Run noncdb_to_pdb.sql

so for whatever reason if step 3 fails can i re-start the step 3?  please advise.