Recently took our L sofa/sleeper couch apart and out the door. Took my wife and me about 30 minutes, and the pieces do come out in small pieces. The trick to gain space was move the drivers seat as far foward as posible and the passenger seat back. That give open space to swing the largest pieces out the door. There is nothing holding the assembly to the walls, only floor screws hold it in. If you have a specific question ask me.
2016 Allegro Bus 40 AP
2015 Cadillac SRX towed car
1991 Avanti Convertible/2019 Tesla Model X