Measure and mark the baseboard adapter to the length of your wood trim. Cut the adapter to the proper length with the tin snips.
Spray a little adhesive on the bottom of the corner and the back of the baseboard adapter. Press and hold the baseboard adapter for 15 seconds against the bottom of the wall.
Measure from the baseboard adapter to the top of the wall with a measuring tape. Measure and cut the bullnose corner bead to that length.
Spray a little adhesive on the corner and the back of the bullnose corner bead. Press and hold the corner bead for 15 seconds against the corner of the drywall. Allow it to dry for several hours before applying plaster.