I have a pretty good answer, which is not backed by any documentary evidence, but is just from observation of the systems and the actual goings on in the systems…….but, I suspect another "non expert" on prune might like to explain it as we have discussed this matter before.
I am surprised he has not piped up yet.
27/09
May I suggest your cold / hot starts should be;
Cold start :
Set full throttle and mixture
YES
Prime till fuel flow gauge rises and stabilises
YES Or count 1-2-3-
Mixture to Idle Cut Off
YES
Set Throttle to idle
Yes, or crack it just a fraction, idle may be a bit low (fully closed) so just about where you think 1000 RPM would be
Hand on throttle and crank engine.
No hand on throttle, just on the mixture
As engine fires up set RPM
As engine fires roll the mixture up….just about half way, usually no more then let the rpm settle and lean to just past peak ROM…Job done!
Mixture to Full Rich
Never required on the ground until you line up to go 
From a cold start I've never known an engine not to start first time using this method.
Hot Start
I find hot starts are not generally as easy as a cold start.
They are easier (refer above and delete the prime), if it is a genuine hot start, say after land/refuel, simply leave the throttle in the 1000RPM idle/taxi position and crank, at the first cough roll the mixture in as per above.
you may need the boost pump after that if there are any vapour locks.
The need to prime depends on how long since shut down.
Yeah and that usually is a few hours. 30 minutes is a hot start except for kiwi's in winter 
Hope that helps!