I never seen an article which explained how to level the fretboard without strings for a starting point. This make sense if you are going to level the frets. I will try this the next time I change strings on one of my guitars. I wonder how much relief there is after the strings are installed? I would image it all depends on which string set up is used.
Guitars:
Electric: Washburn HB-30, Squier Tele Custom Deluxe, Jay Turser Strat.
Acoustic: Seagull S6.
AMPs: VOX AD30VT, Peavey Envoy 110.
Modelers: V-AMP 2, Digitech RP-100A.
Pedals: Boss RC-2 Loop Station, Boss CE-5 Chorus Ensemble, Digitech Bad Monkey, Ibanez DE7 Delay/Echo, DOD VFX40B 7-Band Graphic EQ, Ibanez CS-5 Super Chorus.