[jart]

I never would have been able to understand lambda calculus well enough to write the blog post if I started with [0]. I say just pull out the shell and start coding things. Then read [0] later to appreciate things on a deeper level.

[mbivert]

I think I must agree: while I went through [0] to build a λ-calculus interpreter, I already had a fair amount of practice with Church encoding (list, bool, int) using an arbitrary functional language, which retrospectively must have helped greatly to make Selinger's notes clearer.