Need some opinions. I've been reading-up on the wiring for DCC, and so far I'm understanding it---I think...lol....Anyway, since I've only got 6-7 switches on the entire layout, I'm hoping it will be pretty straight forward. At this point, I'm trying to avoid any reverse looping, etc...........New the question---in regard to the locomotives......Should I install the decoders myself, or have the hobby shop do it? Is it difficult? I realize that some engines are easier than others, BUT, what would you recommend? Keep in mind that I'm no electrician. Once I get past screwing in a lightbulb, things start getting hazy. Yet, if it's a "straight forward" process, I'll give it a try.