If the environment you plan on testing in is substantially different from the one you practice in, it wouldn't hurt to do a couple of PTs in your testing environment.
When you're working with two indicators, you choose one and just keep in mind that the other indicator is attached to one of your terms. For example:
When dealing with your group 3 "without" you need to keep in mind that cannot is attached to A so …
What specifically are you having a hard time with? If you've never went through the core curriculum before, my advice would be to keep going. You can do hard things.
Something that I did while I was going through the core curriculum was that I did …