I'll let others answer the HEM question, since I only use mine for one room and it's not a place I'll review specific hands often.As for picking the right hands to review, I would look for two requirements:- Common situations that come up (something like a 3bet situation with AQ versus a loose player you only have vague reads on).  Something like "Facing a river CR with my small straight on 3 flush paired board versus a tight regular" is probably not nearly as important to your learning.- Situation you're not sure of.  By not sure I don't mean just lacking confidence, as many people are confident and wrong.  If you can't back up your view enough to convince another player, or if a stronger player disagrees, you shouldn't be positive that your line/choice is the best one.  Always look to have strong indications or evidence that your decisions in common areas are correct.  If you don't have that, then you need to weigh all the options again and really look for evidence.  In the end, if you can't definitively figure it out, post the hand for review in the forums here.

It's really easy to watch a whole game in the reviewer.  First thing you must do is in the results and you have to double click on the column table heading Level.  You need the order of the hands to go from small to large bb level.  If you don't do this the game will run in reverse.   Then you just right click on any hand and a table will pop up.  Click on Replay All hands.   There is a speed control slider to the right of the go button. Let me know if you want a hud.  I have a great one.