I was lucky that the previous owner had cut the guards to fit the 35's so I just needed to screw them on. There was a bit of fiddling and trimming around the custom rear bar but alls good.
When I fitted the LRA flares to my 2 door rangie, we just used an angle grinder with a thin blade and it worked a treat, well Stooge had that under control ;)
I got the passengers side on this afternoon, knocked off a bit early, so she's all done now. Only took about 2hrs all up, but longer if you had to cut the guards obviously, plus mine is a 2 door so I didnt have to mess around with back doors.

