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Check option 5 in this Instructable: https://www.instructables.com/Find-exact-center-and-drill-concentric-holes-in-me/ This is how I was taught to do it. This technique gives you the hole in the center pretty easily.
Deer will indeed jump over a 6' fence to get to fruit or vegetables. I started with 6' and had to add an additional 2' at the top, which is much harder than doing it 8' to start.
Have you thought of starting in the center of the field, and working your way outward, reducing the amount of driving all the way around the field? I believe that is what the commercial farmers in my neighborhood do.Great instructable for folks that want to move up from a few raised beds. I have fruit trees and grapes, so I don't have to plow, but I do make wine.
DIY functional Sonic Screwdriver
trendy belts from old bicycle tires
How to build a storage/transportation box for your quadcopter.
Toner transfer no-soak, high-quality, double sided PCBs at home