2 tools missing to do it right ,, VAR headset pliers, and the appropriate headset hook spanner..

bene sugg: a new headset will have the need of a 32mm open end headset wrench ,
and maybe a second one, or a 12" adjustable wrench..

those are more common tools.

headsets last a long time if the adjustment never loosens, and to keep it from loosening
the locknut scheme, 2 nuts tightened against each other, has to be tight.