1. Determine the Realm
Every action is either a corporeal action, an ethereal action or a celestial action. In many cases, this is based on what realm the given skill or power is in. Singing a corporeal song is a corporeal action, using an ethereal skill is an ethereal action. Sometimes, an action may be a little more open ended. Generally, if an action involves physical interaction, it's corporeal, if it involves mental or social interaction, it's ethereal.
2. Determine the Forces
Every character should have a rating in each Force from 0-5. This is the base number for the check. Specific Skills or bonuses or equipment may add 1 individually to that base number for the action. Personal or Situational aspects may be invoked to add plus 1 to a specific relevant action(this costs 1 fate unless directly created by another action). Discord or damage reduces your base number by 1 each in the appropriate category.
3. Determine the Difficulty
The difficulty for an action is generally the corresponding realm of the defender or a static difficulty based on the complexity of the action. A normal action will have a difficulty of 2, an easy action 1, more difficult actions will be between 3 and 9. If a defender is actively defending(using their action), they may also do a draw to determine their total and may add skills to their total.
4. Draw a card(or roll dice)
Once you have the forces and the difficulty, pull a card from the deck or roll 3 fate dice. Add or subtract the total from the forces and compare that number to the difficulty. If it equals or exceeds the difficulty, the action succeeds.
5. Spend Fate to re-draw if desired
Mortals may spend a Fate Point to redo the draw if they want.
6. Apply Consequences or Results
A successful action can create an aspect that lasts for a scene or until invoked or undone.
A successful action can do 1 damage to the appropriate realm when able.
A successful action can overcome an obstacle.