if i remember correctly the dipstick has a couple of kinks in it that mark the top and bottom of where the oil level should be. if its a small amount over its not gonna hurt the engine too much but be careful if it is really high.
Also, remember the basics when checking your oil....engine should be cool, been left to sit for some time (so that the oil pools at the bottom of the engine) and (and i cant stress this enough) the car MUST be on a level surface.
If the car is leaning forward at all then the dipstick will overread as its at the front of the engine!!