If you don't have the cash to pay a shop to measure and cut appropriately, I'm thinking you don't have and accurate way to measure deck height at each corner.
If you start thinking you're over your head, just have it cut .004 and call it good.
If you do and can, even better.
Now I hate to see people argue over what you should do with your motor, and honestly for the most part and overall it will run fine if toy decide not to run it zero deck, however it would be a complete and utter lie to say it wouldn't run a lttle better, make a little more torque at all rpms if you do zero deck it and run a higher 8.5-8.6 dynamic 91 octane...you would also be running less total timing due to a faster burn as well, that might make a smidge more mileage. Either way, people shouldn't get into it with eachother over it. Good luck.