Houston: we have a problem

While doing yard cleanup this past weekend, Wifey and I had further realization that we have a tall oak tree that has increasing lean into the yard.  I saw the lean when I was first visiting the house and knew it'd eventually be a problem, but it would appear that "eventually" translates to "soon."

By adding in a web-based protractor into the image, it looks to be around a 17 degree off vertical lean.  I never measured it a year ago, but I don't really feel comfortable letting it persist for too long.

Why am I posting his here?  Because the garden is in danger.  I haven't calculated the height of the tree, but just by calibrated eyeball if it were to fall as it's leaning I'm guessing that around 1/4 to 1/3 of the garden would be hit by the top of the tree.  The crop damage would be left to the strawberries.  The fence posts on the downslope side of the garden would be most likely to be damaged.

We're going to be soliciting quotes to have at least the top 1/2 of the tree dropped professionally.  Considering I like woodworking, I'm salivating at the prospect of getting a chainsaw mill to mill my own lumber.  Given my experience at paying mill fees, milling a good amount of the tree myself would make the chainsaw mill pay for itself right there.