Light Bulb just went on. How magic works? (Newbie)

[Gargoyle]

Please tell me if I have this right:

A) A spells school of magic (for instance a lvl 2 Enchantment) is not the Level of Magic skill you need. The Spell itself might say Fire 1 & Death 1, and thats the skill required to cast it.

B) A magic user with skill fire 3 could cast a spell that required fire skill six by using 3 gems to cast it.

C) A magic user could cast a spell that required fire skill 6 if he/she were only fire skill 2 by either have a magic item that boosted his/her skill OR by casting a boosting spell OR by being empowered to a higher skill level.

D) This is a question based on if all the above is right. Could a skill lvl fire 1 mage have an item to boost to skill 2, use a spell boost (now skill 3 for the battle), and then use 3 gems to cast a skill 6 spell?