Are you registering the domain name to a home or business address? I can't confirm it's still the case as I'm on my mobile and won't be on a computer for a while but when I registered a domain name 2 years ago it was possible for anyone to see the postal address a domain name is registered to. Fine if it's a business address or you have a PO box number but no so good if you're using your home address. If you have a .co.uk address and do not use it for business purposes you can change it so the postal address the domain is registered to becomes hidden to most people, the equivalent of going ex-directory. At the time it wasn't possible to do this with a .com address.
This might not be the case today but certainly worth checking out if you will be registering a domain name to your home address.
If you have a .uk for PERSONAL use, in some cases you can hide your contact details. You cannot for commercial businesses.
With a .com (etc) you can usually buy, though it's generally free, whois guard which hides your details.
However, within about 3 clicks of Google you can find my address. A lot of my business is online and having an address makes it more reputable (not a PO box!!). If I wasn't sure how reputable a business was, I would look at the WHOIS. If it's hidden then I'd go elsewhere. I don't hide the whois on any of my domains.
Currently the most annoying thing that happens is a dodgy registration company sending my requests to transfer to them.
Hiding it is fine for personal projects, but even then you should have at least a working email address.