I like the underhand toss. I throw it left-handed to have my right hand on the aileron-elevator stick. I also use a neckstrap on my tx, which actually complicates things a little, but works fine.

Take a step with the airplane, and use a full arm swing. You want to get a night high release speed, but you don't want sudden accleration getting there. If you accelerate too hard, the fuel will surge to the back of the tank, and the engine will sag at just the perfectly wrong time.

Here is a picture of me throwing one of my A class planes. Note the direction of the flag at the tip of the antenna, I'm thowing in to a pretty good crosswind here. I've also had to thow downwind. In those kinds of cases, I just try to throw a little harder, and at a slightly more vertical angle. I then let the nose start dropping a bit on it's own to avoid a stall. In a crosswind, you can expect the plane to yaw, either into the wind, or sometimes downwind, depending on your throw, the wind, and the airplane. I usually let it go a few degrees rather than trying to react too fast. Over-reaction will lead to a crash for sure. Because I like to let the plane fly a bit, I always lanch away from people, regarless of the wind. People who handlanch parallel to the pilot line give me the willies.



Here I'm thowing my B class plane in a heavy left-to-right wind. Note that the wind has gotten under the left wing, and the plane is starting a right turn. This was an underhanded lanch, but you can see how high up the plane already is, and you can see the "follow through" and the fact that I use my whole body to step in to the arm swing.



The earlier suggestions of trying it over tall grass for the first few times are good ones.

Oh, I don't trim in up elevator on launch either, I try to be trimmed for straight and level. The launch leaves the plane nose-up, and I want the plane to stay in the attitude I give it for climb out.