It's all a matter of practice! I also found it very difficult when I started but I can breeze through now (though I've never finished incursion). I think FD were very wise in giving premium betas practice well in advance of the multiplayer part
I manage to get to the last (?) three in Incursion, but they blow me up every time. By the that point my ship is pretty much banged up, and I find very difficult fight three opponents in normal circumstances, so after a few other fights it is tough.
I lost track where they are and from where they are shooting at me.
I went through the Cobra + Imperial fighters mission (Incursion?) last night. After several failed attempts at the stealthy approach I noticed that at mission start only the Cobra was showing as hostile, the other three were neutral. So, nail the Cobra first then go after the others. Worked like a treat and I was even more surprised to that each time I attacked an Imperial only that one went hostile, the others stayed neutral. Made picking them off very easy![]()
To put this in other words:
Fly close Farrago Four (around 500m), shoot 6-8 bursts and then 3 missiles. Rinse and repeat.
http://www.youtube.com/watch?v=FOquKKfEI2o