There is many ways to play like a pro..
1 of the ways is by the guns you use... if your a pro you dont use the strongest/slowest gun you use the weakest fastest gun.
Try not to use famas because it has low ammo.
I use mp5-the stock medic/engineer gun because its fast..and not so weak..
Now what you do is when you are hacking dont use all the hacks the hack offers.. use chams/crosshair/no recoil/premium
Now when you know some1 is at a corner dont go right at him and prefire.. get passed him and do a quick spin not so fast and then roll to a side where he wont be able to shoot you and get up and kill him... the reason for this is he will spray and run out of ammo...
If you are playing legit and you are against some1 that is a high lvl with famas the first thing you do is
Jump around roll around any of those will help you but when you are head to head
Notice-Always press all these buttons back and forth
q-e-c-spacebar and keep reapeating in different patterns which those keys are q left lean e right lean c crouch space get back up ..
everyone aims for the head to get a instant kill but if you move your head around they wont kill you right?
Use this steps and you Like a pro!? xD
BTW: Guns that you would want to use.
-M4a1
-Mp5 stock
-g36dc or whatever
-famas(not a really good choice but its good)
-Mp7