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I am clearing out a whole lot of overgrown yard. Most of it is ivy and other weeds, but there are a couple of trees like a winged elm, a sweetgum, and others, maybe three meters high, maybe 4-5 centimeters trunk at the ground. It seems a bonsai crime to throthem away, and I am in no rush to get them into pots.

What steps do I take? I remember vaguely cutting them off, and the doing something to restrict the size of the root ball, but I have no idea about schedule. I can cut them off and leave them about where they are until spring, doing whatever until then, or even plan on leaving them longer.

What would the process be?

Ivan Mann wrote: What steps do I take?
What would the process be?

Ivan;

Usually you should cut a deep circle around the rootball with a diameter as large as the canopy of the tree.
If you want to be safe, do it half way now and half way next year, in slices, severing half of the underground roots each season.
After these two seasons, prune the trees, pull out the trees, and plant them into a wooden training pot for another season.
Which means three seasons to be safe, if you have the time.

Size of canopy. Is that what I want it to be, roughly half a meter? Or, what it was before chopping 90% of the top off, which was several meters? Or, roughly the size of the pot I might put it in?

Dripping circle.
Not half a meter, not several meters.
Hopefully roots spread as much as the branches horizontally; on the other hand some trees on the ground grow long taproots with fine roots spreading from them.
To be safe, cut enough to be sure the tree will survive: that's why half a circle every year makes sense.

Many species, including acer carpinus and zelkova can be dug from the ground without any preparation. In late winter, early spring lift them. Prune the roots with sharp pruners and put them in good substrate in the smallest container that will take the roots. Keep frostfree, and moist, not wet.

Experience, as we all know, comes from bad judgement. I'll share.

When sawing off the top of a tall tree, hoping that it will grow lots of new little branches, etc., pick where you want to cut, then girdle the bark, the saw the rest off slightly above the barkless ring.

I didn't, and when the saw got almost to the edge the trunk broke off, and fell pulling a long strip of bark, exposing the wood.

A year from now it might be nicely weathered, etc., but I would prefer to pick where the strip would be myself, length, etc. Also, it may be dead.

Ivan, this is indeed good pruning practic. I usually cut the saw though the bark on the back before trimming

Ivan Mann wrote: When sawing off the top of a tall tree, hoping that it will grow lots of new little branches, etc., pick where you want to cut, then girdle the bark, the saw the rest off slightly above the barkless ring.

As we say here, "living and learning"!
Thanks for this very useful information.