1] - Install the required software
pkg install libwacom xf86-input-wacom
2] - Enable needed services
Additions Needed in /etc/rc.conf
You can just use the sysrc command to add them like so, or edit the file and add them manually.
sysrc devd_enable="yes"
sysrc webcamd_enable="yes"
3] - Enable Boot Services
Additions Needed in /boot/loader.conf
cuse_load="YES"
4] - Start Services and Check for Success
service devd start
service devd restart
xsetwacom --list devices