The box method is where u draw a box on the windshield ( Imaginary) and keep the touch down point in tht box at all times. Use throttle to control speed and pitch to control rate of decent.
Depends on the power of your aeroplane. If it's something like a 152, there is a possibility that it won't have sufficient thrust to overcome the drag, although as you're flapless, there's obviously less of this. Doesn't work particularly well with flaps down though. This technique is more often used in the big jets and more powerful props.