Start at the start, carry on through the middle, and then stop.
I have found that that middle part is made up of lots of beginnings. New beginnings, soft reboots, restructures, repositionings, changes of skin.
Embrace new starts. Take the old, put it in a box, and reach into that box for old things as you remember and need them.
For these moments, I recommend Ze Frank’s Invocation for Beginnings: