Backwards stair riding (bashing) is no harder than forwards riding. In fact, most skaters claim it is easier than forwards. However, one does need to get over the mental aspect of backwards bashing to do it.

Just like in forwards stair riding, balance is essential. If you can't skate backwards in a straight line, you really shouldn't be trying to hit the stairs! Proficiency in 180's is definitely helpful.

Bashing backwards is essentially the same as forwards. You need about the same speed (slow jog), you need good balance, and you need a set of stairs that is about your level. (Ie- small if you are just starting)

Approach the stairs, and at around 10 feet away, do a 180. This will give you the time needed to stabilize, and prepare for the steps. As you near the steps, you need to push one leg far behind you, while keeping the other leg in front. Once you hit the stairs, and are in the flight, this stance looks like you have a (near) straight back leg, and a front leg at around 90 degrees in front of you. This wide stance gives you good balance, and allows you to glide down the stairs with ease. Don't forget to look behind you to see where you are going, but not so far as to twist your body and make you fall.

There are a few points that you need to remember. First, keep your stance firm, yet not too rigid. This will allow you to absorb the shock of the steps, while not changing your stance. Also be sure to stand up straight. Most people tend to lean forward when they are first starting out, and this is a bad thing. It is natural tendency to do this, but you must fight to stand up straight. Don't forget your back leg is out there to keep you from falling backwards. Something that may help you to stand up correctly is to keep your head up. Your body will follow your head, and if it is upright then you should naturally stand up and have good form.

Overall, backwards is easier to do than forwards as long as you get over the mental block. Turn early to gain stability, push the leg out just as you are entering the stairs, keep a firm stance, and ride the flight out. Good luck!