Sorry if this sounds like a daft question, but what is the best way to
apply plastic edging strip to wall tiles?

I want to use the strip around a window opening and a door frame in a
bathroom.

Should I fit the strip before tiling i.e. nail or glue it to the wall -
or is it best to try to wedge the strip under the tiles before the
adhesive sets.

Any ideas much appreciated!

ETV