I changed mine a few months ago. Beliveme it is a real pain.
I followed this topic How To: E-brake Adjust (w/ Pics) - b15sentra.net forums
This link is a good help, in spite of the fact that we have aotomatics, and link is for manuals.
If you are going to do yourself, please be very careful with the shift cables, don't touch
anything of this. I had a lot of troubles, because at the end the shift knob was stuck.