I'm not all too experienced with cocaine, but a full gram each the first night doing it seems like a lot...maybe splitting a gram the first night might be a better idea. Just my opinion, since half a gram in one night seemed more than enough for me, and I've done it maybe a total of 10 times ever in the last 2 years (most of them around the same time). Also, start out with small lines, you can always take more but not less, and when you do too much coke it really doesn't feel very good.
Just my two cents.