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It's incredibly easy to do yourself and you will save a good hundred quid or more on labour. Get on YouTube to watch videos about replacing uPVC window units and make your mind up yourself. For me it was definitely worth doing it myself. I'd recommend buying some tools and just be careful with the very sharp moon knife.
https://amzn.eu/d/33N2IMX
https://amzn.eu/d/8RnQ95rAnd some window packers of various thickness in case you decide you need to add or change any.
so how much of a ballache would this be for me to fix myself and is it worth it or do we just pay a man?
also best approach to replacing it?