New English Yew hedge - I am about to plant my potted Yew's (80/100cm ) do I trim to shape after p

As I am about to plant a serpentine shaped hedge which will have a height of 60cm at one end and 120cm at the other and the top also with repeating curves I wonder when I should start trimming it to shape?
Do I trim straight after planting or wait till spring?
All opinions would be appreciated.

 

Might as well wait until spring, as you wont get any new growth for the next six months.

 

Thanks for that Loofah.
While that is my feeling also, to get anywhere near to the shape I want will require the lead shoots of several plants cutting back by at least 30cm and a number of side shoots by a similar amount.
Would leaving till spring be long enough for the potted plants to get re-established prior to trimming to shape?

 

I guess I'm still unsure when is best time to trim to shape!

 

I will go with the principle of planting now as advised and cutting to shape in spring.

I was intending to add a dressing of "Fish- blood & bone" in the bottom of the planting hole and also a light dressing of the same around the top.
Am I right with this?

 

I'd use fish blood and bone in the bottom of the hole, but not as a top dressing - here that attracts the foxes, and also my current dog (who is a greedy beggar!). I'd mulch around the plants with a bit of compost, instead.

 

Thanks Clare G and Loofah for the helpful comments which I am happy to take on board . . .