You can purchase beneficial nematodes and apply them as directed, retails for around $20/pint. My problem with grubs isn't them eating roots, it's the skunks destroying my beds to dig up the grubs.

Here is a link that might be useful: nematodes

I understand your thinking - I similarly like to thoroughly investigate something before trying it in the garden. However, you haven't started your garden yet...so yes, you are over-reacting about these "pests". Don't try to fix the problem before you're aware of a problem even existing.

If you have fast-draining sandy soil, you will want to amend it with lots compost to help with water retention. Throw some seeds in the ground and put a few plants in...if you subsequently have bug problems, ask around this forum for some organic control methods. The best control is healthy plants, and that starts with healthy soil. Maybe a soil test will help you with some more detail on how to get started amending your soil. Good luck!

I use milkly white spores.