Fairly easy to assemble, just make sure the correct arm rests are placed on the correct side.  I made a mistake of installing the incorrect arm rest and the lumbar cushion.  The right arm rest when raised swigles a bit.  I'm calling for a service part replacement.  The left handle tilts the lock position but does not lock in a desired backward position.  It only locks on the upright position.  Chair is very firm and great for those with back issues.  Has a great lumbar cushion support and manageable to desire position for your back.  In conclusion although the chair deserves a 5 star rating for comfort,  the only flaws found were that the back cushion is not high enough for resting the neck and head and the seat cushion is a bit tilted forward, making it difficult to sit properly and feels as your are sliding forward out of the seat.  I will pass the chair to wife.