*** most important, get ready to stick to one place for many hours.
stay alert because other people might steal your NM.
if you are certain there's rival, prepare something to steal the monster etc /war to taunt, or /blm /rdm for poison/dia. Being able to kill the NM at all is better than /thf and not being able to kill any
study their pop timing from websites
understand that the NM might not drop the items you want.