"You can't expect it to start functioning at full potential from day one." That was always my problem with everything. I wanted to get in shape so I went full force into dieting and working out, only to burn out in a week or two and go back to the same old habits. The only thing that worked for me was to change one thing at a time so that I didn't feel overwhelmed. Good article on something that affects many of us.
I'm on the same boat as you. We all like to see instant success in the changes we try to make, but the reality of everything is that incremental changes are what build up and lead to the more profound changes we seek. It's hard to say "I'm going to progress slightly each week for 26 weeks until I hit my goal" and follow through with that.