DIY Doctor UK DIY Forums

I am after some guidance on replacing a door panel in a upvc door. We have just bought a house and one of the exterior upvc doors has a cat flap in it. I am led to believe that replacing the panel is relatively straight forward. My questions are, is it a straight forward job that I could undertake myself, where can I get a replacement panel and how much should I expect to pay roughly.

I appreciate any help
cheers.