Hi Jericho,
Everyone has shared some good advice with you. We've had this discussion before on the forum and some of us agreed that it was NOT a good idea to ALWAYS mix out on the breaks of songs. This is usually the height of the song and what the crowd has been waiting for so they can "cut loose". So, please keep that in mind as you practice with the classics.
As one who'se been at this for more years than I want to count, I agree with you that it is NOT like mixing house or techno. That music is simplistic and synch'd tighter than original disco because most of it has no live players. As you listen to the older music you'll start to get a feel for how the tempos usually shift. Some are extreme, but the majority are workable so you can build your night without cutting out all the highlights.
Good Luck. BTW --- did you spring for Technics? 
Love Has No Time or Place
Nicky
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