Eta Serpentis is half-way up the 'tail' of the serpent, the eastern portion of the constellation.

Farther to the northeast is found theta, a delicate due of white stars nicely resolved in small telescopes or large binoculars.

To find eta, start from the triangle of stars at the southern tip of Serpens Cauda: binoculars. Place omicron at the opposite (southwestern) side of your glasses and nu Ophiuchi appears: binoculars.

Now if you put this last star (nu Oph) at the bottum of your glasses, you'll find zeta Serpentis (fairly faint) at the top. Place this star at the western edge of your glasses and the much brighter eta Ser comes into view. Centre on this star: binoculars.

Theta is two fields to the northeast.