The advice you've already gotten about launching your own plane is good.

I hand launch my own planes all the time but only very lightweight models. Any model with a higher wing loading I either let someone else fly and I launch it or I ask them to launch it. The decision is made on whether or not I think the other person knows how to perform a proper hand launch.

The way to hand launch a plane when you are launching for someone else is to run with the plane until you feel it trying to lift out of your hand. Give it a gentle push and it will fly straight away assuming it's trimmed.