To replace standard cannon pin on high canno pin, it is quite easy task. The Zigmeister used to post his instruction and I follow that and so far I have work on 7 watch on my own. Davidsen offer the high cannon pin at a very resaonable price. I got 8 from him so far.
In addition to make the minute hand flush with the pin, you can also do that without high cannon pin on those base 2 hand models like PAM 009, PAM 000. Doing this the hour hand will seat quite close to dial. But afte finish it does not look bad at all. You must come very close to the watch and sometimes even need the magnificant glass to see it. This will save some cost. With those 3 hands models, this will not work because the hour hand and second hand will interfere each other.
To gride of the minute hand is quite easy. You can start off from the rough filing and end with the #800 or #1200 sand paper. This will make it smooth. But if you cannot do this work or made mistake, Davidsen also offer the capped hand which is ready to use without grinding.
So look in The Zigmeister post to see if he still keep the instruction up there.
Good luck.