I am trying to hide some lettering on a wall in a psd version of a photo. In spite of hours looking at some semi related tutorials on layers and masking and referring to "Photoshop for dummies" I cannot make it work in practice. Very frustrating!
Layer masks may be useful in many cases, for example where you want to blur the background of a picture but keep the main subject in focus. But a layer mask is not applicable here. Cloning is the way to go as 99jon demonstrated.
You don't need to save another psd version. You can simply duplicate the picture layer, do the cloning on the duplicate, and turn off the visibility of the original layer. That way you have the original preserved.