If you have the old style dash like me then it's easy but the ones with touch screen integrated controls are a bit of a none starter. The dash just pulls out, disconnect the connectors on the back and the stereo mounting is exposed. Undo the 4 screws that hold the stereo cage in place and pull it out, disconnect the old stereo. You'll probably need an converter for the wiring which places like Halfrauds do for £10 or so and then the new one should be pretty much plug and play. Check the antenna still gets power and works how you want before you put it all back together as there's usually a couple of different options for how that's powered. Goes back together even easier than it comes apart.
If you have a blanking plate in the lower left of the dash then it's easy to pop that out then you can get a few finger in the hole and pull the dash out from there.