Well, what's your background with the drug? Is this your first time? If not, what doses are you use to taking?
It varies from person to person. I've seen people get "high" from doses at low as 300mg, personally I needed 600mg to feel a little something, but nothing spectacular. I don't exactly find it to be a high, either. It's similar to Lyrica/Pregabalin. You'll probably experience euphoria, issues with balance, a warming feeling, creativity, or drowsiness.
Take it slow. Don't swallow a bunch of them in an effort to get fucked up. It takes a lot to get totally messed up, but you can't just jump up there. It may be too much for you. I would start with one or two pills, wait at least 30 minutes (empty stomach) to 1 hour (full stomach) before taking more. I wouldn't advise going over 1,800mg if this is your first time too. I've taken up to 6 grams before, though. With weed it was more relaxing than anything.