Well, it seems the provided context is about as useful for disassembling a sofa as a chocolate teapot. It's just the legal boilerplate from YouTube. Not to worry, as an expert content creator, I can guide you through this furniture-based puzzle without any help from the search results.
So, you've decided to wrestle the beast known as the manual recliner sofa, likely because you need to move it without removing a doorframe. A noble quest! The key to victory is that most recliner sofas are designed like giant, comfy Lego sets. The backrests are almost always removable.
Your first mission is to explore the mysterious void at the back of the sofa, in the gap between the main seat and the backrest. You may need to peel back a fabric flap, which is usually held in place by Velcro. Behind this curtain of upholstery, you should find the locking mechanism. On each side of a removable backrest, there will be a metal bracket. On that bracket, there's a lever or a tab. This is the secret release latch.
Now for the fun part. You'll need to lift or push this lever (it varies by brand) while simultaneously wiggling and pulling the entire backrest section straight up. This is often a job that requires the dexterity of a safecracker and the strength of a weightlifter, so grabbing a friend is highly recommended. Once you've unlocked and lifted one side, repeat on the other, and the back should pop right off. Do this for each reclining section.
Once the backs are off, you're left with the base, which is still absurdly heavy but is now a much more manageable shape. Congratulations, you've successfully broken down your comfort behemoth into pieces that can actually fit through a doorway. Reassembly is just the reverse: slide the backs on until you hear a satisfying click, which is the sofa's way of admitting defeat.
