I was informed only very recently of another reason that learning the rules of accenting can be helpful: it can sometimes indicate an augment.
Here are three instances from the Hymn to Demeter:
Line 25, a)/i+en, impf.act.ind.3rd.sg. of a)i/w.
Line 38, h)/xhsan, aor.act.ind.3rd.pl. of h)xe/w.
Line 95, gi/nwske, impf.act.ind.3rd.sg. of ginw/skw.
Are these all instances of augmentation, or does the accent move for other reasons? I suspect the first two examples are augmented, although I ...