Tutorial EXPLAIN for idiots?

Hi group,

Does anybody know of an tutorial for EXPLAIN for idiots like me?
(I am fairly confortable with Postgres, but never used EXPLAIN before.)

I need to optimize a few slow running queries, but I am not really
getting it when reading:
http://www.postgresql.org/docs/8.1/interactive/performance-tips.html

A bit hard for starters. :-/

Any tips/sites?

TIA

Regards,
Erwin

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Erwin Moller
Darwine BV

Groenendaal 25f
3011 SK Rotterdam
tel 010-2133996
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