Help removing Window Glare?


I took what I think is a very good picture from my office window, but there's substantial reflection of the interior of my office in the frame. I have no idea how to use any software (I just downloaded GIMP but it doesn't mean anything to me!) I'm truly a novice. I am hoping to print and frame this picture but I'd love to remove the glare/reflection first. Is this an easy thing to do?

I'm also willing to paypal someone to do it, if you think it's possible but too involved for a beginner.

Thanks so much!