Although the install doesn't seem too involved, to
@wilheldp_PE's point, it would give more peace of mind to have a professional do it I think. I spoke to a local retailer and gave them all the specs. They quoted me $750 for everything including the install. I also asked about vented vs. non-vented and he said since I already have a traditional fireplace with a chimney, I wouldn't realize the benefits of non-vented. This isn't something I plan to use all winter either. Probably only have it on weekends we are home and when people are visiting.
In addition to the concerns above, there's also some parts I'm unfamiliar with (see photo below). I assume this is some sort of regulator/diffuser? Can that just be taken off and then connected to whatever inlet assembly there is for the gas log? Assuming I can even remove it to begin with. It's looks pretty worn. Or do I leave the large part and just remove the gas tube? :dunno: