Rant XL is more of a developed course.
The problem with un supervised self teach is that it can cause more problems to solve than it helps.
Personally I would say use simulators etc once you have actually done the lesson with the instructor to reinforce the lesson but don't try and self teach yourself as it can do more harm than good.
I know others will disagree with this.
I would say get Rant XL and work your way through it and leave the rest until you start your course.