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@Dutch_Cheese
In the past I've ruined plenty headsets (Campag record, cheap steel Tange Levin etc..., Galli, Zeus, Stronglight needle, ....)
For me it was a clear sign not to mess with alternative tools.
I also learned that a TOO TIGHT headset could be ruined within 1 or 2 days, but a too loose headset didn't cause trouble.
Since Shimano introduced cartridge type headset bearings, it became a bit easier.
The cartridges have some degrees "play" inside the holders/cups and are able to find the right position.
So, even if the headtube is not faced perfectly and the cups are not exactly parallel, the bearings sit perfectly.
So, yes, I do assemble headsets without proper reaming/facing/ press-in tools and ride those bikes. If possible with Shmn headsets, butr sometimes others.
But I strongly recommend all others to have the cups/cones installed with the right tools.