Clean surface with alcohol. If  the surface is not glass or factory paint, test surface to see if alcohol will harm it. If the surface has wax on it, make sure all wax is removed.

Place image on surface and tape with 2 small pieces of masking tape on top edge. Make sure that the lettering is not kinked and lays flat on the surface.

Tape top of lettering with a masking tape hinge.

Peel backing paper away from lettering. If the image is large, ask a friend to hold a corner.

Hold lettering away from surface while squeegeeing it on with 4" strokes. Using firm squeegee pressure, begin at top center and work down and outward to edge of lettering. Do not allow lettering to touch surface until squeegee forces it down. This will prevent wrinkles and keep bubbles to a minimum.

Peel back application tape. To prevent delamination, peel tape at 180 degrees, pulling it back on itself. Pop any bubbles with a pin or sharp Xacto or razor blade and press out air. Finally, place backing paper over image and squeegee with firm pressure. Backing paper will prevent damage and streaking.

Large images can be cut into strips.
If there are no horizontal lines, you can cut the lettering into easy to handle strips. Of course, this should be done after the top is taped.