Not on the forums much at the moment but I hope it's not too late for some advice.
Other than standard things like 'there will be cheesy net lists', 'know what your stuff does' and the plethora of general competition wargaming advice there's not a lot to say.
- Be really aware of the time limits. X wing tournies are fairly fast paced so you don't have loads of time.
- People are there for competitive fun. The upper echelons are there for a laugh but will play well. Measurements are important because the game can be quite tight in close dog fights so pedantry is prevalent. It does, however, mean that people accept their mistakes however small and it makes marking moves big and clever.
- Expect to be schooled by 12 year olds. The Porkins cup showed that wee folk who are really committed to the game can play awesome matches and great combos. It's scary.
That's about it. The local scene is pretty friendly so I'm sure you'll have a laugh
Murphy's Laws of Combat (excerpts);
- If it's stupid but it works, it isn't stupid
- Never forget that your weapon was made by the lowest bidder
- Field experience is something you don't get until just after you need it