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This on the new Octavia?
Not stupid at all. I changed one on my mum's TFSI A4 and it's piss easy if you've got sufficient access.
Just check the warranty situation as others have said.
It's also worth clearing the code and seeing if it returns first.
NurseHolliday-
Aye, cleared the code and it came back after a day or so. Code points me to a particular sensor but I don't have the nouse to be 100% sure it just needs replaced. Booked it in for a proper diagnostic tomorrow. I also need them to look at a creak in the rear suspension so if they say the sensor just needs replaced, I'll ask them for a quote. If they say more than £300 then I think I'll give it a go myself as I can see all of the places where I'd need access to swap it out and the tool is only £10. If there is any ludicrous suspension work required I'll be going back to the dealer.
stevo_com
OBD reader (P2414 code) tells me I might need a new Lambda Sensor. Bank 1 Sensor 1, which I believe from googling is pre-cat so the one I can access from the engine bay. How stupid would it be to source the part and special socket tool (~£180) and swap it myself vs get a garage to do it?