This is quite expensive and you must actually have accomplished something to qualify so for most of us a better route would be to buy a knighthood from Sealand.

https://sealandgov.org/product-category/titles/

I became a Count there several years ago and my son is a knight.

Now you may say that a piece of paper that claims nobility from an arbitrary country may be useless but I fail to see why my nobility is any less valid than those "granted" throughout the rest of Europe.