The Nomen protocol and indexer are new software, but getting your nomen is simple and low risk.
Using your Bitcoin wallet, create an unsigned transaction paying a UTXO back to yourself. Make sure to slightly overestimate your fees, since we will be adding a bit of extra data to it.
Copy the transaction to your clipboard as a base64-encoded PSBT (this is just a menu option in Sparrow, for example).
On the Explorer, click “New Name” and paste the PSBT into the form, along with the name and public key. The public key is just an X-only schnorr key. You can even use your Nostr npub.
When you submit the form, it will return a new PSBT with the extra output for Nomen. Copy and import it back into your wallet (again, this is just a simple menu option in Sparrow).
Verify that nothing has changed except for the new 0sat output and you can see that no one is stealing your funds. Then sign it and broadcast it! That simple, really. Low risk.
You can then publish a records Nostr event nostr:note1tx8zmgajjq4srlnuflrqu65p6dm9gr2j5864l3nys5gvkdcfzajszzxsqw