Replacing carpet in my symphony

Hi just purchased my 1993 symphony and want to replace carpets is this fairly straightforward or has any body any advise did think about carpet tiles carpet has been put over original so could use this as a ten plate ,need to change it as its a bit smelly might try to clean depending on how difficult it will be and advice would be very welcomed thanks .

You can get some carpets made up but you would need to cutout some paper templates unless you can lift the current carpets so they have a pattern to work to.