Hi, congratulations with your progress so far
An interview with a real crew manager is a good thing, much better than being stuck playing stupid games with a 'Recruitment' person who has no experience or knowledge of the job. You won't feel the need to play up to meet their artificial standards and spend the whole time worrying about what it is that they are really watching for! So the best advice for starters is to be yourself, be natural and be at ease! It's certainly advantageous to come across as calm and relaxed - remember that the job you are applying for has being able to deal with difficult situations as a central requirement. This isn't always easy in an interview of course, but I doubt it will be as daunting as you anticipate once you get going. There are really two areas that the role of a Guard encompasses, customer service and responsibility. Gather all the relevant experiences and abilities that you can, and work through it in your mind so you have some 'ammunition' ready for when this comes up. Do some research on the company and things like their operating area, primary stations, parent company and so on; you won't be expected to be an expert but they will be hoping for a little interest I imagine. Having a few sensible questions of your own is always good too, focussing on the job itself and avoiding sounding too eager about things like the salary and time off etc. Try your best to give the impression of being a friendly, approachable and level-headed person, and you'll be fine!
Very best of luck
