Commitment issues? Use Smart Objects.
The Workflow
- Right-click your layer > Convert to Smart Object.
- Go to Filter > Noise > Add Noise.
- Set Amount to 10%, Uniform, Monochromatic.
Why It Wins
Because the layer is a Smart Object, the Noise becomes a Smart Filter. You can look at it an hour later, double-click the “Add Noise” label in the layer stack, and change it to 5%. If you destructively baked the noise, you’d be stuck.