..with a 5K.
On my city route (0ish, windy, dry), i remember how I visualized my final 5K of my last half marathon. It was something like
"No problem, I run 5K all the time, just 5 more to go"
I didn't work so well.. I usually start my 5Ks with a burst of speed. The last 5K of a half is not so easy.. And the last 6 miles of a marathon will not be so easy. Time to try new mental games.