How to properly build a minimal FreeBSD kernel?

Is there any proper way to build a minimal kernel for FreeBSD? The FreeBSD Handbook has the lack of information about this. By default, the size of /boot/kernel directory around 450MB and this is pretty big. I want to minimize kernel fingerprint and remove all unnecessary modules and options. Should I use "NO_MODULES" option in /etc/make.conf? Or use C compilation flags?