How to change wiper blade?

How to change wiper blades on a Cutlass Supreme 95?

I already changed blades on other cars like Windstar, Accent...
But on Cutlass, it's different. I don't know how to remove the blade.
I need to pull hard, or there's a trick?
Which type of blade do I need?
I realized also that in this car, the washer fluid jet exits from the wiper blade arm (not shown on pics), not from the car body.
It's why I'm afraid to damage it.

http://img35.imageshack.us/img35/5862/dsc00014lv.jpg

http://img41.imageshack.us/img41/7383/dsc00015pg.jpg

http://img41.imageshack.us/img41/217/dsc00016kw.jpg

There might be a tab on bottom that you push. Either that or just give it a good twist/pull off.

There might be a tab on bottom that you push. Either that or just give it a good twist/pull off.

Thanks, I'll try that tomorrow.

Ok, I was able to remove the blade using your advice. It's so easy.
The problem now is that wipers blade at sore don't have the tab. So they can't be holded.
I will see tomorrow if I can get original blades from GM.