As comfortable as I am to hooking up a gas line, I'm just comfortable enought to do my propane line to my grill. Hooking up a natural gas line is just one of those things that I'd rather have someone who knows what they're doing show me first. Well, my Dad showed me a few years ago. I'd re-do my own gas line hook-up but I wouldn't do my neighbor's. It's just one of those things that, yes, you can smell but you can't see, and if it doesn't go right, the loss can be significant. There aren't any tricks to this but there are RIGHT and WRONG ways to do it.
My $.02 is to pay someone who's done it before and have them show you. If it doesn't go right for you, you may end up losing your recent 'inheritance', and possibly more! My best to ya and hope this helps.