Migration from 5.5 to 6.2 without single user access

[Olivier Nicole]

Hi,

I am upgrading a remote server (very remote, 10,000 km) and I have no
way to access the machine in single user mode.

Is there a recommended way to do the upgrade from 5.5 to 6.2? 

Do everything in multi-user, but kill all services but sshd?

Thanks,

Olivier