I actually think you can start phase 2 anytime you're ready.
The not drinking part may not be easy but it is pretty simple.
Do not drink no matter what. Do not raise the glass to your lips.
Do whatever positive and healthy things you have to do, call on whoever you have to call on to stay sober.
Then...Phase 2
I knew I had to do more than just not drink to stay sober so after I got the not drinking part down,
I started to figure out all the things I used to drink for, and discover healthy ways to deal with those issues, problems or feelings
It's the new life building stage so I think it's best to start that as soon as you feel able.
D