Answer: Without seeing the plant it is very difficult to understand how you wish to trim it and by how much, and to know how that would relate to the branch structure as it has developed over time -- if it is feasible, or not. Since this is now such a large tree I would strongly suggest you consult on site with a professionally trained and certified arborist who has experience with ornamental trees for help in determining the best way to prune it. If you are talking about removing a substantial portion of the plant it would really be best to have professional guidance and equipment to do the job safely -- both for you and for the tree. I'm sorry I can't be more specific long distance.
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