I want to learn this RPG system before I try to run a game but it's hard to test my understanding without playing.

I want to learn this RPG system before I try to run a game but it's hard to test my understanding without playing.
So the solution I think is to play solo but how to test familiarity with procedure?
Do I know how to have a range combat behind cover? Perform a con check against poison? Attack inanimate objects? Have a psionic fight? Endure maddening revelation?

Make a party of minimal characters. Only what needs to be there. A fighter needs ST 14 give him that. Don't worry about IQ unless he faces a test.

I'm thinking of a systemless dungeon that is like an obstacle course.
A piniata full of scorpions hangs. When each player has attacked with their melee weapons, Dodge flying scorpions. One of them must save versus poison (but not die)
Track damage but not HP. Have a pool of water. Make them swim and almost drown. Have people throw tennis balls at each other.
What else?