Agreed
If u don’t know how to use ether or are unfamiliar with how your glow plugs work/when disabled, then don’t use.
(Some engines automatically fire glow plugs when you key on the ignition (even briefly as you turn key past glow plugs to start position, moreover the engine should be up and spinning and most are way to generous with amount used)
Service an factory ether injection system to understand.
Unless you can reach your air intake from the operator seat I don’t think it can really be done safely with one person.