Hard to give the best advice as different country and different line of work, but the most important thing is confidence.
Don't stress about ifs and maybes, just face it as a normal thing and normal people.
Keep an ear open for anything that you can expand upon as well, and throw in the casual reference to past experience with a situation if it comes up.
At the end of the day you are selling yourself so confidence (not arrogance lol) is what can be the difference between a Yes and a No when they compare the candidates.
Good luck mate and if you get it, the beer is on you