WARNING : Do NOT use that method of "buy a gram and divide it up" that is exactly what i did, and since i have no experience of drugs or powder weights generally it landed me in serious problems since my supplier (in error) sent me 10-25 grams of it when i bought 1 gram. i drank 3.5 grams in 1 shot in solution with water and followed it with a bomb of around 1 gram, and gave a 2 gram bomb to my gf to take.... we had some pretty trippy side effects but we're ok now. I didnt know and i really wish i had been more careful. I lost my boner for 3 days, saw all kinds of bugs and things in the shadows, couldnt sleep for 3 days, impaired vision for the first hour, mouth as dry as a desert for 2 days etc.
Dont mess around when it comes to things like this, if you're gonna do it more than once invest in scales, if not just start with a minute amount on the wrong end of a spoon and work up. much safer.