If you don't have confidence in yourself, then you're likely to fail. There's always going to be unforeseen problems but it's in solving those problems that you learn.
Keep the stock key fob handy or you may have to put the key in the ignition to stop it at the moment. Really shouldn't run into the issue though. The alarm unit will have a "factory alarm disarm" wire (light green or light green/black of DEI units if I remember correctly).
I remember looking through a manual for a way to slow down the LED on a friend's unit. Not the same unit, but is a Viper. I didn't find anything. I did read about a feature it has that once the car is sitting for a certain period of time, it will automatically slow down to preserve power. That's all I've got though. Read through the manual, if your unit has the option, you'll find it in there.