okay guys, sorry that i couldnt talk you through what to do in the video but here is step by step;
1) make sure you have atleast 5 daedric arrows, then make your way to solitude. 2) go into the castle dour at night time so all the gaurds are sleeping. 3) pick pocket the gaurds and take there arrows, the replace it with one daedric arrow. 4) wait until morning and collect the arrows being fired.
if you get caught stealing, just load the auto save, i saved the game after every guard i gave the arrows,
hope this has helped just an easy way to get good arrows :)