building kernel and userland while normal operation or in single user mode?

[Alex Greif]

Hi,

I follow current and rebuild kernel and userland as described faq5.html 
but I wonder about the following, that I could not find in the docs:

can I recompile and install everything while all the daemons are still 
running (eg pf, httpd, spamd, relayd, dovecot, postgresql, ...)
or is it better to stop all deamons that I started in rc.conf.local 
before recompiling,
or is it even better to boot into single user mode?

Any tips on the prefered method is appreciated.

Thanks,
Alex.