Oxy with Isotonitazene. Dose advice.

I acquired a few Oxy 80mg pressed pills, vendor was very open about them being cut Isotonitazene however it is "safe" for use if responsible. Reviews from buyers say they had a good time but I am sill a bit weary. Gonna snort the pills, what should my starting dose be? I was thinking 1-2mg as I do not want to OD. Anyone have any advice?