Hi Chris,
little hard to explain but here goes, start of by hooking the worm through the mouth and then slowly push the body through the middle, feeding the body though up the hook. Now if its a long worm then you can keep pushing and feeding the worm pass the hook and then up the fishing line. You would like to leave the hook hanging out. The worm should look straight and natural. For a better hold you should use a bait holder long shank hook.
You should gently cast you line out, not too hard or else the worm will just rip off due to the whipping action.
now half of the worms I pumped were cut in half and most were 2~3 cm. With these I would hook them on like all you can eat style. Works great.
Good luck!