ReadyA quiet-enough room
You do not need silence. You need a room where a fan, a television or a conversation is not sitting on top of your voice. Background noise is the most common reason an attempt cannot be scored.
ReadyHeadphones, if you use sound at all
Headphones are optional and never required. If you do use residual hearing or amplification, they keep the app audio out of the microphone, which makes the recording cleaner.
ReadyA mirror, or your front camera
Many first sounds are made at the lips or the teeth, where you can see them. Being able to watch your own mouth turns the articulation cue into something you can check yourself.
ReadyEight minutes, not an hour
Short and frequent beats long and occasional. Plan a session you will repeat tomorrow rather than one you will dread.