This kendo instructional video introduces a way to practice okuri-ashi called shiho-ashi-sabaki. Shiho-ashi-sabaki is a combination of 4 okuri ashi to 4 different directions, front, back, right and left.
The points you have to pay attention to:
- Keep the balance: especially upper body.
- Maintain the good stance (many change the width between their feet)
- Do it slowly until you get the hang of it.
The footwork is more important than learning how to cut in kendo.
Footwork: Okuri Ashi Practice