You could probably smoke half of a regular-sized joint and get pretty blazed if it's your first time and it's good stuff. I would just smoke it all but that's me haha. The first time I got high was some of the best stuff I ever had. I put it in the middle storage thing in my truck and on a 5 minute ride on the way home my whole truck smelled like dank ass bud. We smoked 1 joint at a time and we both got blazed 4 times in the first day, once the next day. And he's an experienced toker. So I think you'd be fine with half of a joint. If you don't get high enough you could always smoke more haha. Also, remember to inhale and suck in some air right after your hit. Hold it for a couple seconds then exhale. Just letting you know because a lot of people don't get high the first time because they're not really sure what they're doing. I got ripped my first time because I inhaled.