It does take a little bit to get used to, when you leave behind the traditional channels, and banks of channels on your scanner. This radio allows you to group things into scan lists, pretty much however you want them arranged.
I would suggest downloading a programming software for your scanner, which is basically the GRE PSR-500 inside a RadioShack skin, and getting the programming cable. That way you can see things in front of you, and is much easier than trying to program by hand. If you purchase a premium subscription to this site, then your programming software can retrieve radio system information from this site.
Being in eastern MontCo, I would also suggest programming in Bucks County. This is especially with the amount of time that the fire companies spend running back and forth across County Line Rd.
Either way, you need to look at how you want to group things you want to listen to, into scan lists. You have 20 scan lists to choose from. (There are ways to use more than that, but I am keeping this simple.)