Disposable electrodes are very easy to use.
They come with a peel and stick adhesive.
You pop on an electrode, generally with a
button-like attachment to the electrode wire.
Peel off the covering, and stick the electrode
in place.  They remove easily and no
sterilization of the electrodes is needed.

The disposable electrodes are relatively
expensive, however.  Often, if you have to
reapply an electrode, it will not restick and
you have to use yet another one.  You
probably won't be able to attach the
electrode to the earlobe, and you'll have
to use the mastoid placement.  Some
audiologists prefer the earlobe placement
because it may enhance the size of the
first wave of the ABR.