I'm resistant to purchasing every electronic miracle from the overlords of oriental production because of the way they treat their workers, and the life test program (the quicker the product fails, the quicker they sell another one, yeah yip!). So I still tune pianos remote from home using a tuning fork, made in Germany in the seventies when musical parts were still made by workers with decent wages and conditions. I use Craftsman tools instead of a tuning hammer for the same reason, although Steves brags about the origin of his tools; I may take him up on it some day.
If you tune in straight fifths from the first note of the octave, the top octave comes out about 1/5 tone sharp. (forget cents, that is an artifact of electronic toys that had nothing to do with the Conn Strobotuner, the last electronic tuner produced in a decent shop). So I tune a little flat as I go. I never bothered to learn the number of beats, which saves me from having to suffer from counting them every note for the rest of my life when I should be enjoying the music. You've tuned enough flat if your first octave comes out even, with no beats. I count enough things obsessively, most recently mop strokes to dry out a flooded basement, counting obsessively is really a practice I try to keep under control so I can enjoy the finer things of life.
I'm able to shut this level of tuning acuity off when I'm not actually tuning the piano, and enjoy the music even if the tuning is a little off on the upper octaves (which go flat first if the piano is tight). This allows me to enjoy the Steinway console four years between tunings. However, beating unisons can annoy me, still.
For final tune every couple of years, I use the fundamental flute drawbar of a Hammond H100 organ which use as a tuning reference the AC wall frequncy. The H100 seems to have stretch on the upper octave (not the B3 etc, which doesn't), H100's were made in Chicago 1966-74, cost about $50, and their only limitation as a tuning tool is that they weigh about 350 lb.
Don't pull your piano up to pitch all at once, moving the pins that much can loosen the holes and possibly break strings. Wear safety glasses and use a lot of light.
Have fun and don't worry too much. Moving your tuning pins all the time can't be good for them, anyway.