I strongly agree with the previous suggestions that state having the wheel/tire combo (that you select) available before you do anything. The selected wheel/tire combo must be on the car and ride height set before the flares are aligned. The stock fenders will likely needed to be trimmed before you can this. Keep the trimmed pieces because someone might want them. We just went through this process again and I can reassure you that lots of massaging is needed to get it right.
On a different note, adding that much offset (to the front) can increase the scrub radius quite a bit. Also, lowering the car typically requires the suspension to need adjustment for optimal results. Have you ever driven a car with a substantial scrub radius? Don't forget to check the tire (at both lock to lock positions) flare clearance while doing the flare fitment. High scrub cars can have lots of interference issues at the front and back of the flares. We used custom made wheels and front control arms to achieve an acceptable scrub radius.