Yes, you will need SIA badge
and you need few things:
Patience!
[to explain same thing 10 times, drunk ppl think slowly]
"Thick skin"
[so don't take anything personally, there will be a lot of insults believe me, like those above]
Assertiveness
[you can't be affraid to say NO it's better to have trouble maker getting mad outside then had to get him outside from the venue]
Calmness
[the less you say as an answer, the less aggro you will get back]
"Professional distance"
[from experience I know that the first ones to abuse your trust or given privilages are those who claim to be your friends]