Safety first, if you hire someone use split key generation. A quick example how it works. Obviously the below key should not be used, because it is now compromised. Its just an example.
You go to e.g. bitaddress.org, download (!) the site and open it locally (!). Select the Vanity Wallet option and click generate.
It will show you a public key like this:
0460CF66AB508CA8D57A4CDA5D9846BA6005647E6DAAB93C776F175A5EEE37D50636CA12312BB6F DCC04A759EB3FC18D43232ED6DBF85389C0BC2AB6C6F827830Cand a part private key like this:
E2A908CA171D4A3CD4B81EE35EBD20624428E3A6CE2846BC484973811E8C2CDEYou keep your part of the private key somewhere safe and do not show it to anyone.
You give the public key to the person that will create your vanity address. At this point you might get an escrow involved to secure the funds if there are trust issues.
The person will also need the prefix you want, e.g.
1test.
They run their vanitygen GPU magic... 1test only takes a few seconds on my GPU so I just did it.
You would get the following data returned.
Pattern: 1test
Address: 1testdYwC4vQikygV7XBkQyG1R6emwFh3
PrivkeyPart: 5Hpe9imYL7AejixceWNmVromjHQ9hovZwYXR93o9u1SP7J5DkzP
Notice how the private key part is in a different format. Again open your local copy of bitaddress.org and go to wallet details. Enter the private key, click the button and it will show you the private key in hex format. In this example its
00CE26771E07A19C4393B7978BF3729B94DE799531EDC089B76E7623E8EE1665Now you go back to Vanity Wallet. Enter your part private key in the first field.
E2A908CA171D4A3CD4B81EE35EBD20624428E3A6CE2846BC484973811E8C2CDEand the part you bought in the second field
00CE26771E07A19C4393B7978BF3729B94DE799531EDC089B76E7623E8EE1665Click the button and it will show you the address:
1testdYwC4vQikygV7XBkQyG1R6emwFh3the public key (not important) and the private key in WIF
5KYTtEGWihmKdvjvwiPThkmaWt11twrkPrnz2oEdFg3DrstutryYou make sure that no one sees this private key and import it into your favorite wallet. The wallet might need to rescan the blockchain or something like that, but there will no funds on it.
Contact the escrow to release the funds.
...
Profit.
Talking about profit, let me know which prefix you need and whether or not it should be case sensetive. Keep in mind that the time needed increases exponentially for each symbol. E.g. 7 symbols with case would take ~28 days (with bad luck even longer), 6 symbols w/ case would take ~12 hours.