As others have noted this is trickiest when you have a strong wind from behind.
On one occasion (just north of Crick), when single handed in a very strong wind I had to resort to the following - the towpath (piled) was on the left and the hole on the right:
stop on the left just before the hole
tie the stern temporarily to the piling.
run a very long rope (120 foot) from the bows, along the right gunnel, to the right of the tiller, and tie it to the bank behind the boat
untie the stern, motor forwards, steer away from the bank
when the rope goes tight, increase power and steer to the right as much as possible (not scratching the stern on the bank)
the combined effect of the forces will bring the bows round into the winding hole (if the rope is tied off in the right place),
keep power on and the wind will bring the stern around
once you have turned, disconnect the long rope before you get it around the prop...