Low wing planes are harder to hand launch than high wing which you've figured out. I grew up throwing all my planes and still throw a lot of them so I've got it down pretty well.

If at all possible it's best to have someone else either hold the transmitter or throw the plane. Two hands works best for something like your bipe. One hand behind the wing (lightly) and one just gently under the nose holding the plane level while you take about a 4-step run to launch.

If you're by yourself then you hold behind the wing and before you let go you grip with only two fingers so the plane can rotate while you're still holding it. When it rotates to the position you want it to fly out of your hand you release. Depending on the power you want anywhere from 10 degrees down to 10 degrees up. Most guys who don't know how to hand launch want to throw their planes 45 degrees up where it stalls and goes back into the ground.

Also, go to your hard and pick up a stick with your throwing hand and hold your transmitter in the other hand. Practice throwing the stick and getting your hands on the transmitter sticks without bumping them. That will save you a lot of frightening moments after launches.