The final step is riding your wheel for awhile. And then re-true it. Once is almost always enough.
I also use the strumming method. I spin the wheel and insert my thumbnail to the correct depth. I am not a detail guy. Never have been. The first wheelset I built, nearly 10 years ago, is still in regular use. Still straight and true. It's not rocket science.
But. Even before I began building wheels, for many years, I very much enjoyed truing them. For me, that is where it's at. Lacing is just a means to an end.