Why do you think a provider would want to stalk YOU.  Are you George Clooney? I am pretty sure they have better things to do with their time than stalk a quasi, wanna-be hobbyist.
 As for disease free... there is always a chance, but remember, the provider is equally concerned about contracting a disease. Precautions are taken, yet there is some risk involved. If you aren't comfortable with that then this isn't a hobby you should consider.