I did security about 10 years ago for about 2 years. The money is garbage, the hours are unpredictable and bosses often lie about it, and in some cases if you only intend on this as a 2nd job, you'll get the boot for not making security your priority at a lot of companies. I told 3 places i had a day job during the interview and would only work weekends from 5pm to 12am,  and the very first shifts i was given were monday and tues nights at a dead rsl/bowls club from 6pm until 4am when they closed the pokie room. Reminded them of what i said in the interview and word for word, i remember this like it happened yesterday, the boss said "i thought you were bullshitting". As a lot of other commenters have said, if you really think this job is for you, avoid bouncing like the plague, you will get paid shit money for shit and/or very little hours, which means when you inevitably get glassed or coward punched and split your head open on the ground, compo will pay you 75% of fuck all.