Halfords don't sell the blades unless it's 05 onwards.
But like the user said earlier, hold the arm in one hand and flip the plastic cover with the other. Take 30 seconds to change them.
Where did you get the blades from? Renault are a rip off, Ebay is good, www.wiperblades.co.uk are good and www.speeding.co.uk are good too
Steve Mason, January 2009