Assembly for coping and mounting trim molding

A method for installing a first finish trim molding and a second finish trim molding in a corner formed by a perpendicular intersection of a first vertical wall and a second vertical wall, the method comprising:

• installing a first trim holding device on the first vertical, the first trim holding device comprising a first mounting bracket attached in facing contact with the first vertical wall, the first trim holding device further comprising a first pair of mounting flanges disposed on the first mounting bracket and extending perpendicularly outward from the first mounting bracket, the first pair of mounting flanges configured to engage a first pair of channels defined in a first rear surface of a first finish trim molding;
• installing a second trim holding device on the second vertical wall, the second trim holding device comprising a second mounting bracket attached in facing contact with the second vertical wall, the second trim holding device further comprising a second pair of mounting flanges disposed on the second mounting bracket and extending perpendicularly outward from the second mounting bracket, the second pair of mounting flanges configured to engage a second pair of channels defined in a second rear surface of a second finish trim molding;
• mounting the first finish trim molding onto the first trim holding device by stabbing the first pair of mounting flanges into the first pair of channels, the first finish trim molding defining a first end surface parallel to the second vertical wall, the first end surface installed abutting the second vertical wall;
• coping a second end of the second finish trim molding to foul' an end shape of the second end complimentary to a profile of an outer surface of the first finish trim molding opposite from the first rear surface;
• and
• mounting the second finish trim molding on the second trim holding device by stabbing the second pair of mounting flanges into the second pair of channels, the second finish trim molding positioned with the end shape of the second end closely fitting the profile of the outer surface of the first finish trim molding.