1 grab a hammer / brick / old electrical appliance from the house
2 hit windscreen as many times as you like (making sure you keep clear of your precious bodywork)
3 call auto windscreens
4 arrange for them to come fix it (have your insurance cert at hand and 50 notes)
5 auto windscreens arrive, screen fitted - pay them the 50 notes
6 make cup of tea and admire your new screen
Note - you need fully comp insurance to do this, and no wont affect your NCB
when i had one of my cars resprayed i did this with all the windows on the car hahahah