This video shows how to properly trim around fixtures when installing vinyl siding.
Installing vinyl wall trim.
Press the vinyl trim up against the wall and press firmly all along the base to secure it to the wall.
Butt one end of the vinyl against the door molding or into the corner.
Use your hands and press along the length of the vinyl trim making sure it is even with the ground.
Cut the trim so it is two channel widths longer than the opening s width.
Scrape away old caulking around windows and doors.
Nail the trim every 12 inches on center.
Install j channels at doors and windows and under roof eaves and rakes.
Press the vinyl against the wall and flush on the floor as you work down the wall.
Along the tops install j channel trim with horizontal siding and base trim with vertical siding.
The build up of old caulking interferes with the positioning of new trim for the siding.
If the trim sticks out too far you may be using more adhesive than necessary.