I would have required that a professional install it.

After moving out, we re-stained the front porch posts with a darker stain (photo is pre-stain), replaced the front door, did touch-up painting on walls and trim, installed new keyed-alike locks on front/back door, and installed a vented bathroom exhaust fan that wasn't there prior. 

I had them installed during the remodel up there.The first floor where my wife and I currently occupy is also recently updated with a new kitchen, all new appliances and is also a 2 bedroom with a fully finished basement.

Keep in mind, you will likely have to install a sprinkler system, among making other changes for the home to be used for that purpose.

You can create furnace filter size, when XYZ got installed, lockbox number, etc.

I know someone who installs security systems.

After a thorough review of systems, we had plumbers troubleshoot and repair/replace a couple of small chronic bathroom leak issues, and electricians installed a number of end-runs back to the panels so that rooms could each have window A/Cs running without tripping circuits and other such issue.

I’ve found that as long as they’re somewhat insulated and well installed the color won’t matter.

I tried to estimate what a GC might cost in my calculations, but I have an uncle who does roofing and cousins with window installation and landscaping businesses, so I believe I can save some significant costs through their help and guidance. 

In a lot of cases, there was a drainage system installed but it was not properly maintained and therefore doesn't work.