Yes, the solved examples can be the Ultimate Guide, maybe even a teacher (if you can imagine someone solving it step by step).

Use the solved example section in the following manner: Depending on the Number of solved examples enlisted, use the first question as a guide and then solve the next question by yourself, if you don't get it, refer the first example again and carefully see what methods or means of solving are used, then try the Second question again

Yes, Mathematics can be really tough sometimes, but still you should know that you can become really great at it, through time and effort. I recommend you about reading about scientist or mathematicians who struggled with Mathematics, this specifically helped me to know that it's natural to strug...