You haven't mentioned what size engine you plan to start. The smaller engines are often hand started by experienced modelers. And the very large ones as well. But some are real killers and nobody with any brains tries to start them. but.........

Fill up the fuel tank, finger choke the engine to insure that fuel is being drawn into the engine and that there is some in the engine, connect a glowplug igniter (the battery thingie), and then some very experienced flyers can start their engines with just their hands by flipping the prop.

Some guys who're familiar with the proceedure can start their engines with just a power source for the glowplug and their hands. They either flip the prop in the direction it turns with the engine running, or they "back flip" it, or they "bump" it. And some "snap" the spinner and not the prop. But all of them have the right prop on the engine, a sensible start position for the needle setting, and are familiar with the safety precautions that keep them relatively safe. Oh yeah, and some of them wear safety gloves or use a chicken stick. And most all of them have cut their hands or fingers in the past, some badly.

What size engine? What prop have you put on it?