  LINC-NIRVANA (LN) is one of the instruments on-board the Large Binocular
Telescope (LBT). LN is a high-resolution, near-infrared imager equipped with an
advanced adaptive optics module. LN implements layer-oriented Multi-Conjugate
Adaptive Optics (MCAO) approach using two independent wavefront sensors per
side of the binocular telescope measuring the turbulence volume above the
telescope. The capability of acquiring up to 20 Natural Guide Stars
simultaneously from two distinct fields of view, and using them for wavefront
sensing with 20 separate pyramids per side of the telescope makes the LN MCAO
system one of a kind.
  Commissioning of the left MCAO channel is almost complete, while that of the
right arm is on-going. The Science Verification on the left side is expected to
start soon after the MCAO performance is optimised for faint guide stars. In
this article, we put together the lessons learned during the commissioning of
the LN MCAO module. We hope and believe that this article will help the future
MCAO instrument commissioning teams.
