Replacing Near Side Rear Quarter

[pjd7325]

Hi All,
I am from the UK and owned my 1993 SVX for about a month.
I have had an accident with a post at a car park at work and badly dented my near side rear quarter.
The damage is too bad for the dent to be popped out and I need to replace it. Has anyone done this before? If so is an easy job or would I need to contact a speacist body shop? I do have reasonable mechanical sense but no welding experience.
Thanks,
Paul.