Hey there dude, yea i just recently aqcuired some 5 x myself and was quite satisfied and being precise on dosage is something that is quite important. I would say the best way to judge is, well first, use a bong, with a meduim sized bowl, and pack roughly half a bowl, maybe a lil less the first time. that is roughly 0.05- 0.1 and that should do the trick. One warning, well not really a warning but a precaution, like with any drug u feel like ur going to know whats going to happen to u most of the time, salvia, is completely differnt and unique to any drug i have ever tried, and is NOTHING like i expected. I melted into my friends couch and his wall the 3rd time i tried it and found myself laughing my ass off till almost passing out becuase of not breathing lol. So i beleive half of a bowl is pretty good, make sure u HOLD IT IN THOUGH, for atleast 20 seconds or it wont work, first time i tried it, i mixed it with weed, but didnt hold in it, the other times i did it by itself, which i find the best thing to do, well atleast smoking it purely, liek when i did i was stoned already, but its better to toke it without anything else in the bowl, easier to hold in. But yea, just pack about half a bowl first time, a lil more next time if u wish, hold it in for atleast 20 secs, put down the bong, sitt and relax and enjoy,