My poor DH tried his hardest to do it himself but he was jsut so confused. All I wanted was a round solitare on a gold band. Didn't think that was too hard but there is a huge choice out there. One saturday morning he suggested we go shopping and I'm always up for shopping. He took me into every jewellers in town and I got to pick as many rings as I liked and then he went back and looked at all the choices I made and he got to make the final decision on which one he liked.
He wanted to make sure that I loved the ring because I would have to wear it for the rest of my life and he didn't want to get one I hated but wore because it was my engagement ring.
I would suggest helping him out because the ring I had always wanted, loved and adored looked absolutely awful on.
Good luck and have a fantastic time leading up to the big question.