Heres a video how I replaced the fuel filter in my nissan.

Overall process was quite reasonable if you are mechanically orientated. I found instructions on the net and it took be a good 1-2 hours to get the job done.

Car: 2004 Nissan X-Trail (2.5L petrol + manual)

In the end job was relative easy and a great way to save $$$, no special tools needed, basically a large flat head screwdriver and a mallet.