One other vendor whose bookmark I can't find actually had an instruction sheet where they claim the only cut needed was an X-shaped one for the shift knob, but it's always good to hear about your real-world experience with the wheel-well bubbles.
Yes, I had to do that. The best way is to lay the old carpet set on top of the new and use it as a pattern for where to cut, but you have to be really careful not to cut too far.... leave the cuts a little short, then adjust when the carpet is in place.
There's very little extra material on the sides, so care must be taken to avoid coming up short on one side.
Once you resign yourself to slitting the bubbles in the wheel well covers, it's no big deal, but the cut pile carpet masks the adjustment better than the loop style.... the loop style shows every cut. It would be much better if the covers were made to snap onto the wheel wells.
3M adhesive is your friend. <img src="/forums/images/graemlins/wink.gif" alt="" />
I used a double layer of automotive carpet pad.... cut in strips and glued to the low areas of the corrugated channels in the rear floor, so I can kneel without ruining my knees. <img src="/forums/images/graemlins/baby.gif" alt="" />
I also took the piece for the rear cargo area to an automotive upholstery shop and had them bind the edges.
If you ask, they'll make any color or fabric style.... just might take a while longer and cost a few dollars more.
The main thing is to take a lot of time to measure before you cut anything.
Frank