Here’s something to keep in mind at an interview: Put yourself in the other person’s shoes. The interviewer has feelings too, such as, fear, pride, contempt, or even slight paranora.
Sure, you want to show enthusiasm. But you want to reign it in a bit if you’ve been looking for a job for a long time and are desperate. It’s sort like not getting any for a while, going to ladies night and getting a drink thrown in your face because you might have said something or touched something you normally wouldn’t have. The only woman you’re going to connect with is the skank that nobody else wants.
The key here is to stay relaxed and always maintain your focus.
Secondly, always keep in mind that she (Company X) is at ladies night (interview) for a reason. She (Company X) wants or needs a man (sales engineer).
Thirdly, the only thing that should stand out about you in the first five minutes is that you are nothing like that ex-boyfriend (ex-employee). Once she (Company X) is satisfied that you are not the reincarnation of the “Kenny Ford” (“Kenny Ford”), you have a clean slate and can paint a beautiful picture.