Often after clicking Print, I find mistakes (the document was incorrectly spaced or I have ....

Stop the print job by clicking on Start, then Settings, then Printers. Choose your printer if there are more than one on the list. Then choose Printer from the menu at the top of the screen and click on Purge Print Documents.
If you see a printer icon on the lower right-hand side of the task bar at the bottom of the screen, you may be able to double-click it for a faster way to bring up the print window where you can purge the print documents.

The quickest way to stop printing is to snatch all of the blank paper out of the feed tray. (Don't try to stop a page that has already started to feed.) You will get a box that tells you that you have no paper, and you will get a choice of "continue" or "cancel". Cancel cancels the job without any of the clicking and choosing described by Riddle.

Don't fix your document and hit continue -- it will not be fixed in the spooled file that had begun to print. Cancel, fix, and repeat the print command to spool a fresh copy of the document to the printer.

On the HP P1000 you can press the red (cancel / no) button on the front right side of the printer. This will cancel the printing process immediately.
It also removes the document from the printer queue.