Vinyl windows are so popular nowadays because they are the cheapest. There are brands that sell vinyl windows as less as half the buying price of their wood counterparts.
This is the first thing that you should do. Remove the jamb extension and the trim from around the existing old window is to use a prybar to remove the window.
You are not entirely alone if the thought of selecting windows and doors for replacement in your current home or for your new home gives you a few knots in your stomach.