Question: To apply vinyl lettering to a interior wall,
Options:
place the lettering, with the plastic still attached, against the wall.  Use a spatula to firmly pull the lettering off the wall.  Gently peel the plastic off and ensure the lettering sticks.
place the lettering, with the plastic still attached, against the wall.  Use a spatula to firmly press the lettering onto the wall.  Gently peel the plastic off and ensure the lettering sticks.
Answer: place the lettering, with the plastic still attached, against the wall.  Use a spatula to firmly press the lettering onto the wall.  Gently peel the plastic off and ensure the lettering sticks.