Its interesting, coz the first few times I tried pills I remember thinking at the time "man... I dont feel fucked at all?!? I dont think this pill is working very well.." and then looking back on it a few days later and realising that I actually remember very little of the night, other than some random wanderings and dancing.
One thing everyone needs to come to terms with is that you will *never* have a pill experience like your first time. Why? Coz its the one and only time that you have no clue whatsoever as to what is happening to you. How awesome would it be if we could forget what its like to have pills after every time we had them.. but sadly after that first experience you know what is gonna happen and you try and look out for the signs its working.
Dont chase the high, you wont ever get that feeling like you did your first time. You know whats happening now and trying to anticipate it often makes you trivialise how you feel and get into the whole "its not working..." state of mind. You dont need to be shaking in a ball in the corner to actually be 'fucked up'.
Like everyone has said, keep it low, dont be a hungy hippo. Your drugs generally work at their own pace, so if you havent felt something after exactly an hour, dont have more, wait. Once I got past that I suddenly realised that I didnt need quite as much as I was taking to get the same high, I just needed to be a little more patient and let the drug run its course..
Anyway, I didnt plan to write this much, got a bit carried away

. Listen to what people tell you and as great as pills etc appear to be to you now, the best way to keep them feeling that way is to not overdo them.
stace.