Have to agree with pretty much everything BackPacker said. If you cannot afford it, it may be money down the drain (or out the window from 1000ft).
There are alternatives to a JAA PPL. If all you want to do is FLYING, then microlights are a great route. Don't forget that many of the new ones give the old spamcans a run for their money.
There is one thing I would do and two I wouldn't:
DO get a couple of trial lessons first. There are many who dream of flight, but once in the cockpit find they don't enjoy it as much as they thought.
DON'T pay a full course up front - ever! Even if the school is trying to entice you with discounts. Don't do it.
DON'T do the one-lesson-every-other-week thing. While I am sure there are some highly competent people out there who learned to fly that way, this approach simply is not conducive to properly learning anything, let alone flying an a/c.