Please install an extra machine with version 4.5_907.
- Then join your existing array and have all your array and ens settings synchronized.
- Detach the new server
- Upgrade your new server to version 4.5_933
- Upgrade your new server to version 4.6_911
You now know or the upgrade is successful and you can either upgrade the old or use your "clean" new server and take the "old" one out.
Moving a certificate should not be difficult. Take your time testing the procedure. You could use a temp server and test the certificate installation by overwriting your local DNS lookup by editing your local hosts file.