The first piece of advice anyone will tell you is ‘To act drunk you need to pretend not to be drunk’ – there is a lot of truth in this, to convincingly play a drunk you may need to use some reverse psychology as very often a drunk is actually trying

If you’re trying to act drunk, mess up your hair and wear your clothes sloppily, since people who are drunk don’t pay much attention to how they look. Also, stumble around as if you’re slightly off balance, because motor control goes quickly when yo

Acting sober can be easy or hard depending on how drunk you are and what you are doing. The goal is to know your limits. If you drink uncontrollably, at some point you will not be able to act sober regardless of your skill.