Oxymorphone is a bit more serious than other opioids you might come across. IIRC the K71 is 10mg so as long as you consume it orally you should be relatively safe to try 1 and assess what it does for you.
Orally oxymorphone has a 10 % bioavailability so eating one at a time with plenty of time between consumption is a solid plan. You will see threads where people snort and shoot OM and that's where it gets dangerous.
Take a peek at the thread below, just stick to eating them one at a time and you should be able to judge what they're all about. Stay Safe and Conservative with your amounts,.