Do you want to do repair in the future? This will be a nice experience, but it is not the best "first step" for a beginner...
You are dealing with mains and 120VDC and it is not a simple circuit I assume...
Think twice, triple measure everything, and use the rule "always one hand in your pocket"... Anyway it is all up to you, not to a EEVBlog at the end of the day. It´s your skin not mine...
If you are too scared sell it here at 50$, better to have 10$ in your pocket than to have a bad or dangerous experience.
Anyway open it up and take some pictures... the EE dragons here will give you some further advices..