How do I train to be a P3 Planner?

You could pay Pv for a course....or;

Get a job as a project coordinator or something

Buy a copy of Paul E Harris’ book on P3. You can find it at Amazon and Paul is a member here at pp (I’ll take my commission later Paul ;) )

quietly offer to write maintain and report the project schedule. Most smaller companies do not employ specialist planners and, in my experience, it is not a popular task (too removed from the workface for some, I guess). Keep the schedule simple to start with, ask questions here when you have them (but better to find a mentor who can look over your shoulder when you need them, P3 problems are notoriously difficult to explain in text...)

Once you have finished Paul’s book, you will be ready to really start getting into the guts of the programme and do some of the cooler things that it is capable of.

At this point, I would suggest trying to get a job with a larger firm as a junior scheduler so you can be part of building a big properly structured plan, this is where the eggs are imo.

If you have the aptitude for it, you will pick it up but beware, it is a steep learning curve and not the most intuitive interface (putting it mildly). It’s worth it though, and you will kick youself forever if you content yourself with MSP.

Download the software