I just had mine off - the instructions are accurate. It really is that easy.
If your armrests are adjustable (not all chair models have adjustable arms), there is a lever in the forward end of the arm. Rest your hand on top with fingers over the end and pull up on the lever located there. Raise/lower the arm to the desired position and release the lever to lock it.
If it is not adjustable, there is no lever in the forward tip of the arm.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC