I haven't had to make the conscious decision to change my social group. As part of my recovery, my plan was to tell as many people as I could I was sober now. My closest drinking friends didn't believe me, but as I continued to show them I was sober in situations I normally wouldn't be, they have come around and are supportive throughout their continuance of drinking.
If these are friends that will be with you through anything, they will accept your sobriety and support you in your decsions. I was, by far, the worst drinker of the mix, even some of them were concerned about me, so it's been an easy transition.
If these people don't support you, sobriety gives you the right to be selfish and stubborn. Just continue to distance and politely decline any invitations to drink. It's good you are thinking about who is a positive and negative support for you.