What MetalCraze said. If you are really finding Freespace 2 to be uberhard either are playing it in Very Hard, that is something like Maese Masoch dificulty, or are really bad about space dogfights.
Learn the controls from memory, and configure them to be in patterned clusters around the keyboard. The basic thing you need to do is target the closest enemy, match speeds, hug its tail, and fire at it with basic pattern understanding. When he goes kaboom repeat with the next one, and if someone comes to help that one change focus to its saviour, blow him, and then go on with the pattern, don't worry about going back to the one you just left, he will either attack you, thus becoming the closest enemy, or go around until someone puts a missile on its exaust. If someone puts a missile on you launch a counter, do some erratic turn that does not put you in collision curse with the warhead and fire those afterburners. And learn to play with those energy setup thingies with one hand while dogfighting with the other, you can greatly enhance your abuse output by adapting your energy setup to the situation mid-flight, or at least memorize the missions and then use lulls in the action to change your setup.
If you have good reflexes and reactions and, like, manage to not get killed a lot the only ship you will need in the entire game is the first interceptor thingie you can get, and the only payload you will ever need are a pod of rockets and a pod of stilettos. With that configuration and a lot of skill you can ironman the game on hard, since it can do everything you will ever need to do, from dogfighting a wing of dragons (nya, if you are having trouble now wait until those start to appear!) to killing some big ship to defending a convoy from enemy bombs.
If you are not in that league choose the heaviest ship you are confortable with, but my friends always call those the coffins because you will die a lot more using those than using some interceptor thingie with 90 on hull, since not getting hit is way better than resisting two and a half blasts more. Better to develop the skill to fly the interceptor, too, because otherwise your ending is not going to be, like, supervery nice and all that. If you want you can later change the first interceptor for the Vasudan one, but the payload options are diferent and you can't solo everything with that one.
Or play on easy :wink:
Oh, yeah, and remember to dive, dive, dive and hit your burners, pilot. :D I love this game so much.