I suggest not working up, and starting with at least two. I also suggest the "handbook for the therapeutic use of LSD-25", you'll find it if you google it. MAPS has it on their site, I think. 15 a hit is not a horrible price, but not a great one, for most acid. Either someone's reselling to you at a 5-10 dollar profit per hit, or the original seller is BANKING on you.