Sorry for being late to this thread, I rarely deviate from the HijackThis forums..
Although it is possible to learn how HijackThis works in detail by reading tutorials on the subject, including the one available from Bleeping Computer, you will still need to go through some sort of training in order to recognize the infections in such logs. I, myself, went through the training course available on GeeksToGo, which is now one of the places I help teach how to work HIjackThis logs at. For more information on training there, you can take a look here.
There are also other schools that will teach you about HijackThis, such as CastleCops, MRU, and Bleeping Computer.
It is really interesting to get such a unique perspective on the way malware infects computers, and the ways used to get rid of such crap.
In addition, the reason people like me just seem to show up from nowhere, is because most of us regularly do work at half a dozen forums, or more. Usually at one of the main fourms, where you can also learn how to read HJT logs from.