Just be VERY careful and whatever the label states regarding precaution, triple the advice.
A rule of thumb generally is if a compound kills effectively for more than one season, it's persistant and it's likely to kill more than the intended target.
Be keen for livestock, pets, and kids - not just at application but again, persistance means ongoing effect.
Read-up on your homeowner liability, perhaps business if you purchase thru your company.
You'll be readily able to buy anything, regardless of state's or federal restrictions, so I can't persuade you enough to exercise caution, least of which is your own or your family's or neighbor's health.
You should be able to (for the same money) head over to John's Island and get some labor at the Taco Stand on Bohicket Rd. Outfit them with some brush cutters and a couple machetes. Take everything to ground level then it shouldn't be too problematic to control the growth couple times a year.
If you have a sprayer and use Paraquat or any 2.4-D compound you'll need to retire it from tree fertilizing forever.