You're not giving away any clues Adobe. As the others say height is a paramount consideration and probably how much room you have around it is also just as important.
Dropping it in the right place is not that easy, have a look on you tube !
8" is quite a diameter, you will need a chainsaw or a lot of energy!
If you are at all lacking in confidence get a tree surgeon in, I agree with landscaper, they are not as expensive as you might think.
Finally have you considered how you are going to get rid of the resultant debris, a professional will do it for you.