1. Not all aircraft can be hand started. no impulse coupling = no hand swing, not all aircraft have impulse magneto(s). shower of sparks type is problematic as are 3 and 4 blade props.
Not true, the famous VH-ACZ was started by hand on at least one occasion by a co-worker of mine when it had a starter failure on the worlds longest mail run. It had Shower of sparks mags.
I think I'd be physically disconnecting the starter just to be sure if I had to do it.
Oh and he started it without having someone hold the switch.
Will it be difficult?
Sure will but he got lucky I guess.