No.
Go to your registrar, DirectNic, and add the 2 new name servers to the actual one. Do not delete the original ones, at least till the new ones propagate thru the system ( can be as long as 72 hours ! ) .
Then check with
http://www.checkdns.net/quickcheck.aspx to see that the new DNS servers are actually working. At this point, you could delete the first 2 original ones if you wish.