Weaning yourself off means gradually lowering your dosage. People do this or attempt to do it so that they can try to avoid the most severe of the withdrawal symptoms. Once a week or so you drop your dosage a fixed amount until you are at a low daily dose at which point you stop completely. You will still go through withdrawals but they should be milder as you aren't stopping cold turkey. This method works for some while others prefer to just stop cold turkey and go through stronger withdrawals for a shorter period.