This one is easy compared to the other stuff....that is...if you have a nice little bench-belt sander handy. I had to trim the laser cut edges at multiple joints to get around the welds in the frame in the foot box area and the far outsides of the firewall where it meets the body. I had to take them off about 6 times on the lowers to get it right. Then, I used my large bench sander to take off at least 1/8" off the top of the firewall like most of you hear only mine was on the passenger side?