are you still NY based?
If so, thats a potential problem - but I am sure you know that
Many here (on AR15.com) send them to shops like ADCO for the work
They will provide a clean, threaded, and quality job for you so you don't have to mess up a good barrel learning how its done
Not meant as disrespecting your competency level here. Just that most aren't tooled and experienced for this procedure.
Is the barrel a 1/7?