HINT HINT... you committed yourself to your LPN, it has a higher "food chain" licensure than an EMT, finish that first, here in California, EMT's make around 9 dollars an hour, LVN's make around 20.
As for me, I did my EMT first in 2000, got working in the field, and realized I couldn't do anything fun. So after being one for 2 years I decided to go into nursing school, I get to do all the stuff that I wasn't "allowed" to do as an EMT practicing as a nurse. If you'd have done the EMT program before hand, it would be like adding to your current skills and knowledge and be very helpful on your PN studies, and make it just that simpler. However, trying to do both at the same time, no-no. If you really want to do the EMT program, even just for fun or the experience, do it while your waiting to take boards, there's 2 ride alongs you have to complete with ambulance companies, and my program required 2 shifts in an ER for exposure as well. There's also ER courses you can take as a nurse to get exposed to the ED, think about that as well, don't work backwards, work forwards.