Congrats on the new purchase. Your network (O2, Vodafone or whoever) should be able to assist or do that for you in a branch if you live near one.
Fingerprint scanner - I think they'll still recognise your fingerprints however they are, could give it a try. If you got a new injury / scar or something you could always remove that scan and re-scan it , or use another finger. If fate comes for your entire (or both) hand(s), well, you'll be worried about scratching your backside more than using a phone I suppose so it'll become a non issue... so for the love of god, be careful!!! haha
The pin number will always work though. I wonder if Android still has that 'pattern' unlock, might be handier?
Modern phones are tougher than you'd think. Can't tell you how many times I've dropped this iPhone 16 since November. Didn't buy a case as I had that 'AppleCare' thing active, but that didn't stop the screen getting scratched like hell and some edges looking a tad rough / denty... ended up buying a case back in April - lesson learnt about boldness.
I think it was already mentioned, but a fold over / wallet style case that holds some of your cards might do the job. Especially if you're not in a rush or constantly glued to your phone, I'm sure flipping it open (like a book) isn't too much of a burden. The 'spine' of the case has plenty of space and gives more protection to the edges of the phone. Plenty of cheap, universal ones but with the power of Amazon you'll find a cheap tailored fit one for your phone.