Single use mode is used to ensure that there is no processes that will mess up as system files change. It is rare, and should never cause problems that won't be fixed by the next restart.
I usually upgrade by running "make buildworld buildkernel installkernel installworld", followed by "reboot". Running mergemaster is good to upgrade any config files, but it takes a little arcane knowledge.
So, if single user mode is difficult, then omit it. It'll work.
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