Most of us just turn the heat on when it gets cold.
You should always void doing this before at least checking things over. You don’t need to be a professional to do this. Of course, if you see something that you don’t really understand call a pro.
However, most of us could at least change the filters, clean, and look around for anything out of the ordinary such as leaks or something that became disconnected. For a furnace changing the air filters takes about two minutes and is very simple. In my video, I show the filters in the return in the ceilings. However, yours could be in the return at the furnace.
Removing one or two covers is always a good idea to look for mouse poop, yes anyone could have field mice.
Once the furnace starts up look for a nice solid bluish flame. If you don’t I would have a pro take a look at it.