First job interview

I had applied for a position that was actually internally advertized in the company, but they were willing to see me anyway. So I sat at a table in front of three guys (operational people, not HR), and it was fun, laid-back, informal. The interview itself went almost too easy. Imagine: no tough questions whatsoever??!! Pretty much giving away a salary range?! I've had tougher interviews than this one. Granted, they weren't professional recruiters, but still, how often does it happen that you feel more seasoned than the interviewer? 

That doesn't mean I nailed it, though. Apart from the fact there are internal candidates, they need someone who will stay for a long time, and frankly, how stable is an adventurous kid who just landed here on a 1-year visa, with several job changes behind him. They know that too.

The position I was interviewing for: instrument technician in a lab at an Oil & Gas company. I have some of the skills they need and it would get me in the industry.