Truing isnt that hard once you can remember which way to turn the spokes. Really.
My comupance into wheel truing were on old Peugeot Helicomatics that always broke spokes on the tight side of the cluster.
I wouldnt recommend learning this way however, for the sake of your sanity
But, I always true on the bike. I set the brakes up properly with about 3mm of clearance and adjust the wheel evenly
in the stays/rear triangle. Then spin it a few time and just watch how it 'undulates'( ??) Ifeel this is better than a stand
because the wheel is actually in the place it should be but I know a more knowledgeable person will disagree.
Just feel the spokes, you can tell which ones are egregiously loose right from the beginning. Tighten them up a little and
go from there. Just remember tightening sucks the rim in. You usually need to loosen the opposite side commensurately
as much as you are tightening the 'wobble' side inward. Just a turn or two at a time or you might run into an out-of-round
(meaning = ovaling ?) situation that is most undesirable.
Clamping a grease pencil or piece of chalk to the bike so it hits the rim on the out-of-true spots helps to mark which
section of the rim the pull in.