The moon and a bright planet may be convenient as a guide to find the comet though they have large apparent motion, too.
The direction and elevation of a Comet can change noticeably in a day due to its fast apparent motion.
You can easily start your observation of a Comet by using Comet Book as a guide to the direction and elevation of the comet.
In addition, the new “3D Solar System seen from Space” mode allows you to view the motion of Comets and planets turning around the sun.
The Comet Book app clearly shows when Comets can be viewed and in which direction.