They are pretty simple once you know how to take them off, the first time is a little harder as you might feel like you are going to break something. I'm sure there are lots of youtube videos on it by this point, so I would suggest a quick search on that. And the bulb size should be 3157 which is pretty standard and you can get at a local parts shop. Here is a thread of the bulb numbers if needed http://www.focusst.org/forum/focus-st-appearance/8666-2013-st-bulb-sizes-types.html.Are the tail lights easy to remove? Anyone know part number for bulb?