Trim !!! Argh!!

[Foot_Soldier]

I cannot fly the Spitfire level and straight for the life of me. What is the correct way to use trim, using the keyboard as input ? Do you tap the keys ? or do you hold the key down longer than a tap ? I am using a low budget Joystick, a saitek cyborg X. Calibration shows no spiking. I us to own a CH setup, Fighterstick, Throttle and pedals, however I sold them. I found I could fly better in the old IL2 series with this setup, but I don't like dropping another $500. My question is, is it possible to fly this sim using the keyboard for trim ? and with a Cyborg X ?
Any info would be appreciated.