And because you can't see the buckle - another photo of a standard English headcollar in case you're not sure what I mean. (I know when I've been to the USA it seems to be more common for them to nose band without buckle.
My helper holds him while I hitch him up.
This photo shows a young shetland pony being put to harness.
And one a bit bigger! being put to for the very first time
I put him to in an outdoor dressage ring, then either work him in there or go out on the grass.
I have to say, though, that I feel much more at risk driving, than I do riding, maybe just because I am less experienced (and skillful) a driver than a rider!
And over many years of working with horses, I have found out (the hard way, sometimes) that you can only buck the odds so many times. Better safe than sorry