Our biggest hassle with this one was that 2 parts were missing, in spite of fantastic machined packaging of parts.  We called the company and they sent the wrong parts out the second time, so we had to have a third set over-nighted from Canada!  Once here, it assembled beautifully and it is really sturdy.  It is very easy to convert back and forth.  The flatten it, you simply pull the seating portion up and toward your mid-section.  It can be converted back using either 1 or 2 people.  Of course 2 is easiest, but if you are solo, just go to the left side, grab ahold of the frame at both top and bottom, and focus pressure on seated area to push it up slightly and back toward the back.  When you get it lined up just right, it goes into place nicely.  We just had to convert it daily for a guest, and after a little practice my 68 year old Mom figured it out and could do it independently.