I know that senior citizens love directions, but my advice is that you've probably confused yourself the most by reading them.
As other's have stated, all you need to focus on is marking a waypoint. That waypoint will be your vehicle, cabin, a road, whatever you need to find your way back to. I would suggest that you get in the habit of naming your way points, I usually make mine something like "home", "main street", "Bob's house" something so you know what it is. That way you don't end up with a bunch of different waypoints called 123, abc, or whatever.
Practice as other's have said, mark your house as a waypoint then take a walk around the neighborhood and see if you can use the gps to find your house.
I have an old "simple" unit so my only experience is with that. My other advice is before using it, turn it on and let it sit outside( with somewhat clear view of the sky) for 10-15 mins. I know I have to do this on my unit to give it some warm up time to find the satellites and figure out where it is.