There is a great DDR Simulator for the PC, it's located at The DWI Webpage (
http://ddrpccentral.teamgwailo.com/DWI/downloads.htm). However, you will need the songs and stuff to play it... however, because I am a supporter of Bemani and all that, I can't tell you where you could get the files for DDR songs. You will have to look around to get them.
If you want me to tell you where you can get them, you will have to PM me =P
But anyways, this is a great DDR simulator called DWI (Dance With Intensity) which is well done and everything. This will help you learn the timing in DDR.
Don't worry, with enough practice, you can do all of the Paranoia's in Maniac! :D