From: (

snip

Anyway I continue... as U. S. Air Force veteran can you imagine that
someone was capable to perform landing in a surface of space object
(never done before) 6 times in a row using completely new technology
without actual testing it?

Every system, including the lander, was extensively tested prior to the first
landing. Feel free to reasearch this. You will find examples of failures and
successes.

Dan, U.S. Air Force, retired