I would let it go for 2 complete season and see were it decides to grow and they way/direction it goes. After 2 seasons you will be able to cut it, carve it, shape and train growth. It is the "mighty" Yew but it is still coniferous and after this cut you really need to let it get established. The one I have recently dug will sit for 3 years and if it is alive I will then be able to work it without killing it.
Grimmy