Go stand in your pilot box and look to your left at the end of your runway. There is a near corner and a far corner, correct? Or left and right, if that is clearer. Make your turn onto final when the model visually intercepts the left (or nearer) corner of the runway. Lines you up on the center every time.

And go up to at least two mistakes of altitude and practice the above advice about controlling rate of descent with throttle . Set your pitch attitude with elevator and leave it alone! Control your rate of descent with throttle. If you are too low, add a bit of power. If you are too high, reduce throttle. Remember: throttle controls ALTITUDE and elevator controls SPEED!

Start learning to steer with rudder-it is more effective than aileron at low speeds. Plus, dropping an aileron at very low speed can induce a stall on that side. Many stall-spin crashes are a result of improper use of aileron on approaches. With a little practice, you'll look like a real hero, with many greased-on landings down the centerline. Go for it!