All of the weapons forms use strategies and movements derived from the Yang Cheng Fu form.
Therefore a student unskilled with the basic form cannot reasonably learn a weapons form.
This is not negotiable.
Competence with the complete Yang Cheng Fu form is a must.
Weapons forms must be practiced slowly until the set is ingrained.
Then, the speed depends on the day's training.
Sometimes, slow practice is good.
At other times, high speed practice is advisable.