Actually its really not that difficult to cut the fender. What I recommend is to test fit them on a piece a cardboard to make sure you have the correct size.
Once you are comfortable with your "template" remove the fender liner and check the area behind where you plan to mount your sidemarker to make sure youre not gonna hit anything back there.
Once that step is good mask off the area you plan on cutting and let it rip!
After you got your hole and are satified with the fit paint the raw edge with anti rust type paint so that in time your fenders wont rust out.
Run the wires and put everything back. Its really not a dangerous mod. On a scale of 1 to 10 I rate this a 2.
Trying for that all "euro" look huh
My name is Joey and I drive a silver car.