Can I fix my glow plugs?

I am having a real problem with starting my car from cold. I have replaced the battery but it still doesnt like starting. The year is 2007 and it has done 90,000 miles.
I have read that the glow plugs may need replacing if so is this the sort of job that I could do or do I need to get the experts in?

Asked on 12 February 2013 by Mick in Italy

Answered by Honest John
Experts. But they may still snap off when they try to extract them. Potential nightmare.
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