Chop potatoes into chunks and boil until just when they break if stuck with a fork. At first you have to really stab them, then they are tender enough to stick but you have to push them back off, They are ready when you don't get to push them because they break around the fork and fall off. Drain them.
Pile butter on top of them, which of course will be inclined to start melting. Start mashing them up with a potato masher. You'll need a butterknife to keep scraping them off the back of the masher. Start sprinkling in onion powder, garlic powder, ground sage, and ground basil. Amounts you have to figure out because your instructor never measures anything and just wings it. Keep mixing and mashing until everything is consistent, then put on low heat and add milk, continuing to mix/mash fast so nothing gets burnt from sitting too long on the bottom. Keep adding milk until you get to the right consistency, and keep mashing and mixing until everything is hot.
The trick is to use about one more potato than you are actually going to need. That one gets eaten as you go along, so you can track the seasonings and correct on the fly.