How much for first time?

I have never done acid before and I want to try it. My buddy just got some gel tabs that claim they're 220ug but I've heard that's pretty uncommon and that they're probably lower. I'm wondering if I should do one tab or to take 1/4th off to make it around 150ug. Some people say they did around 200 there first time and it went well while others say to not do it which is putting me at a crossroads. I am also planning on being by myself for most of the trip.