Not a dendrologist or botanist.
From what I have read and understand, best time to trim live oaks is late summer through end of January. Of course trimming can be done now, but this time of year is generally when the potential for oak wilt transmission begins to accelerate, with fresh cuts an easier path for oak wilt to invade, though it can also take hold in an already compromised tree or via root structure from an already infected tree.
Can always cut and let nature take its course, can cut and cover cuts with some sort of dressing or latex paint, though I think we lack long term studies on what is best to cover cuts and opinion amongst professionals varies greatly.