Step #1) Clean smooth surface thoroughly with soap and water or methyl hydrate.
Step #2) Using Blue Masking Tape, affix masked lettering / decal to surface.
Step #3) Measure twice to ensure lettering is level with available straight lines.
Step #4) Step back to ensure lettering also looks level to the eye & adjust.
Step #5) Apply two strips of blue mask down center, one strip either end.
Step #5) Lift up one half to the center, rip away wax backing and toss away.
Step #6) Holding this half taut and low to the surface smooth from center out.
Step #7) Using hard edge press up and down all along to ensure firm grip.
Step #8) Pull up other half, remove remaining wax paper, apply as before.
Step #9) Slowly pull mask off at a low angle until only the letters remain.
Step #10) Check for any stray bubbles and pop them with a fine pin-point.
Quick Sample Video: https://www.youtube.com/watch?v=Z-iBKtg5ITw