Deformation theory introduction without unnecessary machinery

Question

I would like to find an introduction (book, article and/or lecture course) in deformation theory that does not use unnecessary machinery (for example, schemes instead of complex varietie, or deformations over general artinian rings instead of first-order deformations), but explains some simple ideas. For example, how $Ext^1(E, E)$ is connected with tangent space to deformation space of vector bundles in point $E$, whatever that may mean. It should probably ignore proves of technical details at all. Could you recommend me something?

Answer 1

Almost a year later, I found the necessary part of deformation theory clearly explained in the beginning of Hartshorne Lectures on Deformation Theory. See my question MO:253578 for details.