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Adjust #1cyl when # 6 cyl rocker arms are both in rocking position. (both # 6 cyl rockers arms are both moving)
Adjust #5cyl when # 2 cyl rocker arms are both in rocking position.
Adjust #3 cyl when #4 cyl rocker arms are both in rocking position.
Adjust #6 cyl when #1 cyl rocker arms are both in rocking position.
Adjust #2 cyl when #5 cyl rocker arms are both in rocking position.
Adjust # 4 cyl when # 3 cyl rocker arms are both in rocking position.
I don't explain it well

, but hope it makes sense.
Doing it this way, requires less turns of the crankshaft.
MBHD