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I am now going through Isham's book Modern differential geometry for physicists and got stuck with the notions of etale bundle, presheaf and sheaf. Could someone please suggest some other, more intuitive and more accessible references on etale bundles and sheaves, preferably the ones giving more motivation and sufficiently many explicit (and worked-out) examples and, preferably, accessible to theoretical physicists (i.e., not just mathematicians)?
P.S. To make things clear, a few math texts I have managed to find so far like Godement's and Bredon's Sheaf Theory (two books with the same title) seem way too tough for me. The part on sheaves in Arapura's Algebraic Geometry over Complex Numbers is somewhat better but still a bit too fast going and with too few examples and not too much motivation. Pretty much the same applies to the part on sheaves (which is too brief anyway) in the Clay Institute volume Mirror Symmetry. If there are no suitable books, are there perhaps some good lecture notes on the subject accessible to physicists rather than just mathematicians, from which one get a reasonable intuition on sheaves and stuff?