I would like to know more about how casting spells works on a physical level in the second edition of Warhammer Fantasy Roleplay.
From the books I've learned that casting a spell requires saying some words. Being gagged or having your mouth injured makes it more complicated or impossible to cast spells. I've learned that armor makes casting spells more difficult, and it's apparently possible to use components to help in casting.
Things I'd like to understand better:
Are there any gestures required? If yes, how clear do they have to be? If no how is it that armor impairs spellcasting?
What does a wizard have to do to make use of components? Do they have to touch the components during spellcasting or is it enough to have them "formally in possession"?
Is it possible to tell that a wizard is casting spells by looking at them (without Second Sight)? Are the gestures and words obvious enough to be seen by onlookers?
Are there are any differences in the above for divine, dark and witch lores?
(This may be considered more than one question. I decided to ask it together as it is one general matter, but if I'm wrong, please let me know. I will split it. ;) )