The old method… (the one I used for far too long)
This involved viewing a web page with a problem, trying to guess which style rules to change and then changing them in the style sheet, saving and uploading it back to the server and then reloading the page in the browser. Inevitably I would forget some really important thing that would mean that my new style sheet still wasn’t correct so that would mean going through the whole process again. Sometimes this recursive procedure would go on for quite a while, especially when my internet connection was being slow thus causing untold stress and shortening of life expectancy! What an arse-ache!