8 g of resin, resin is roughly 2-3x concentrate, so you're looking at 16-24 g of cactus (dry) in your resin. even if you hit a holy mother of 5% you're still only getting a bit over a gram of alkaloids (which for many people is not enough)
it cannot kill you, don't worry. its sublime in effect and healing for the body and mind.
if you end up dividing it, you'll probably be underwhelmed, especially as a nexian who is probably familiar to the extra ordinary dimensions dmt offers