I'll give an ideal example of why you MUST have a second person when flyng a glow or gas powered model:

(This was a C/L aircraft... but the engines are THE SAME!)
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A 17 yr old takes his model out to the local flying field, and finds no one else there.[&:]
Stretches out the C/L lines and hooks up to the model... gets all his equipment laid out and sets up a "stooge. " ( a self-launch device that holds the model till a line is pulled, removing a pin.)
No one else has showed up yet... but he's flown alone before...

After 20 min of messing around with a balky engine[:@] that is refusing to actually run more than 4 reveolutions[:@]... he choked the engine with glow igniton still connected. The engine immediately kicked back, slicing his finger to the bone[X(]. Then adding insult to injury... the engine starts and runs perfectly as he gets his hand clear...

The only option at this point... Wrapping a rag on the injured hand... he puts a boot in the prop. (and continues the boots path to squash the plane[>:])
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The 17 yr old was ME.
appx 10 stitches in the right index finger (I was lucky... just missed the tendons)

It took me 30 min to get any help.