All you do is type the URL of the page you want to print or pdf & hit ‘Start!’. PrintWhatYouLike will open a left side window with a number of editing tools. For example if you opened it for this page it would like like this:
I clicked on the picture at the top of the page & you can see that there’s a red box around it. If I click ‘Remove Selected’ in the sidebar it disappears. Voila:
Go through the web page & selectively choose what you do & don’t want in your final version. Then print or pdf in your usual way.