The first week or two for me was indeed a little shakey, but as soberlicious says, it can be difficult to stay sober, or it can be easy. The paradigm shifted 180 when I understood that the whole deal was up to me - easy or difficult, succeed or fail, it was all my call. I put those doubts aside, and decided I would quit whether it was going to be easy or difficult, and that I would succeed no matter what.
If you ask me if it was difficult or not, I don't really have an answer for you, I just did it.