That's one way. The other is similar to roysters' method but instead, use a threaded adapter to screw into the spark plug hole and pressurise the combustion chamber with a shop compressor. I actually watched a video this week where a guy on youtube went through his procedure on his Mighty Max (not the most articulate fella but he got down to the bones of it) -

https://www.youtube.com/watch?v=dIGq_9q0aGU

*WARNING - VOLUME IS SET TO EAR BLEEDING ON THE INTRO. He really needs to spend more time on editing and audio.

OR the magic rope trick...

https://www.youtube.com/watch?v=B8WTTfkyW8g

*Not a Mitsu engine but the process is similar.

2 guys, 2 different engines, 2 different techniques - no formal training or special skills. If they can do it, you got this