Fortunately, Portland is getting dry warm weather for the next 2 days so I got lucky. However, that brings a pretty solid east wind, which creates a slight challenge. The next window won't be so easy either. I have to rebuild the rough opening to make the inside trim symmetrical. The original windows had one window installed an inch higher than the other, plus one side of the bay window is a little wider than the other.
And this was done before crack was invented!