TAKING TOO MUCH

You must use a scale to dose. You don't need anything else. You don't need a pipe, you don't need a lighter, you don't need a cup, you don't cook it - but you must use a scale. Every dose. Most, if not all, "bad trips" are people who took way too much and the number one reason for that is they eyeballed the dose. Get a scale with 0.01g if not, at least 0.1g accuracy.

Number two reason is intentionally taking too much - don't do that either. Work your way up to higher doses.