bay tree pruning
my bay is about ten feet high and six across, multi stemmed, it's been cut several times in the past but I've let it get a bit too tall now. I'd like to reduce the height before I can't see out of the upstairs window. Can't do it when the birds are nesting, it's a bit of a housing estate. What would be the best time? I'd like to make some sort of shape, nothing elaborate, as it is now it could become a ball or a cone.