I don't quite know where to start to advise you, but if it were mine, I would first off, check for two main sections, One for the head and the other for the tail. Work out where half way up the bush is, this is where the head would start splitting away from the back and tail.I would tie one bundle together for one end and then begin on the other creating either the neck which would thin to the head, or the tail. work from the middle out. But please remember that one wrong snip and it will take a long time to rectify. It will take a couple of years before you get the right shape and growth. But it can be done. I tend to start from scratch. I use Lonicera nitida, much quicker growing and I place a new smallish plant inside a wire frame that i have made
on Lawrencia of the Lawnicus, as I have called him, I used an old rubber gardening glove as added features.