The internet is an excellent resource for learning.
You could call me "self taught" but I spent plenty of time watching multiple videos over and over again.
The video posted above is one of the better ones out there, but you can lookup videos by press type and calibre.
Watch them all repeatedly, look for the similarities.
Everybody has their own style but you'll begin to see what the most critical (and safe) methods are.
Take notes and research every part.
Other points to mention would be:
Start picking up brass at the range right now.
Pick up everything you shoot, and ask before picking up anybody else's (it's just etiquette) you can find out who else reloads at your range and someone to talk shop to.
The brass is the most expensive component of the whole cartridge, you'll be happy you have a bucketful when you begin.
Practice!
Make some dummy rounds, forget about powder and primers for the beginning.
Learn about each stage in detail by practicing your die setup.
Learn about belling, seating and crimping, you can always pull them after.
Get an appropriate caliber gauge to check every cartridge you produce.
Forget about how many rounds per minute you can produce right away, take your time.
Take as long as you need to make your first 10 if you have to.
Know how everything is supposed to look and feel when using your press.
Slow steady progress will result in and excellent homemade ammo you have 100% confidence in.
You'll be cranking out boxes before you know it.