I have an old hydrangea aspera in my front yard. It stands at about 10' tall and wide. I would like to reduce its size so that I can maintain it at about 7' so that it doesn't block a dining room window and a path that runs along its side. I have been at the house for about 4 years now and up until now I have only minimally pruned it since I have read that this type of hydrangea doesn't require much pruning. How should I go about renovating this shrub and reducing its size? I know that Rhododendrons can be hacked back to the ground and they'll come back just fine. My preference would be to take a more gradual approach so that the shrub still produces some blooms each year, but I am willing to do what it takes. Also can I start this process now? FYI, I didn't get to pruning it yet this late winter/early spring. Thanks!