Rear bumper help...

Recently, I got into an accident destroying only the driver side bumper end. I was wondering on how to replace this... I ordered the part (about 70$ w/ shipping) but I am unsure on how to put this on/take the old one off. Someone please help me... post a link or something with a diagram or a how-to please!
P.S. I took a look at the car and it seems it is going to be very difficult to get into the space to work. Thanks in advance...