I am very sorry for missunderstanding your question. To trim a bush to be square you can do the following:
- Contact a local gardening service to take care of it for you
- Watch a  video tutorial on a platform of your chosing
- Do it yourself by cutting it as square as you can without cutting to deep into the bush. Repeat this every time you feel like the bush has grown enough to be cut again without damaging the bush.

I hope this helps!
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