The process of substituting all or most of your old windows with new replacement windows is one that few homeowners go through more than once in their lifetime. Thank goodness for that! Replacing all of the windows in your house is extremely expensive. And when the installers come, they turn your house upside-down for a couple of days.

But what do the window installers do exactly? More importantly, what should you do? Let's walk through the replacement window installation process, as done by pros.

Image copyright Pella Corp.; courtesy Pella Corp.