Set up your TX to move the throttle to 100% in each direction... normally the defaults....

Now install the linkages so that with the throttle trim at CENTER, and the stick at center, the carburator opening is as close to half open as you can guesstimate.

Once done, move the stick fully up and observe the servo and linkages to assure that you have no binding, and that the servo is not trying to move the throttle beyond the full open position. If it is, re-adjust your geometry/linkages so this does NOT happen.

Do the same for full stick down but adjust the linkages so that you get CLOSE to a 1mm to 2mm opening showing... it will just be a tiny "slice" open in the carb.
Double check for binding at full throttle.

Once done bring the stick up to about the 20% position and start up your engine.

With the engine running, go into the radio settings and REDUCE your throttle end point for low stick. The engine should speed up.

Do this until the engine is running at about 30% of full power. Now drop the stick all the way down.

The engine should be idling VERY fast or beyond that... now INCREASE your throttle end point for low stick until you get the idle speed you are looking for. As you INCREASE the end point the idle will drop.

Try to set your idle so your plane only just begins to "walk" forward when it is on smooth pavement. Ideally it should not move forward at all.

Once done, keep the stick at idle and bring down your throttle trim all the way ( or on throttle cut equipped RX's hit the throttle cut button ). The engine should then stop immediately assuming no plumbing problems or leaks.

That's it.

I did this one day at the field and I was quite surprised to get a bevey of novices watching saying "so THAT's how you do it!".