I would definately get it in writing. That way there is no room for errors or term confusion.
Will not hurt anything; whereas to not have something in writing down the road may come back to haunt you.
I would advise always get it in writing; you can write the terms yourself. It is not complicated at all; and it is free.
I have learned by my mistakes. But do get proof of insurance or a clear statement of your lack of being liable and that he is indeed an independent contractor. Clearly responsible for his own liability insurance.
Hugs!
Texas Girl
Good luck