Put a Tutorial mode in that gives no rewards and drops hints as to what to do. Enemies do little to no damage. Allows people to learn with no pressure. More experienced players are free to learn blind while the less experienced, capable, and/or confident can learn at their own pace. Increases the pool of players who know what to do, everyone wins.
Simples.
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Cool thought. They could let us launch an particular encounter from a drop down in the raid launch banner. No rewards, just actual practice for that single encounter.