definitely be with friends.... and GOOD ones. as far as how much it's so hard to say.... hopefully you'll be with someone who has done some of that particular batch before... you can always take another chomp if you feel like you need more... but once its in your system, you're locked in... so start slow... take about half of what everyone else is. Most importantly make sure you're in a great mood that day.... if you take them while you're having a shitty day I promise you you wont enjoy yourself... surround yourself with good people, good tunes and take it slow....