Also, get a voltmeter.

Needn't be a whiz-bang one, I used the $15 type with needle readout for years.
Now I use one that cost about $35; it has a digital readout and seems like luxurious high-tech.

This one tool will save you countless hours of pointless figuring and guessing, not to mention telling you what's up with the electrical circuits in your cars and elsewhere.

If you're "completely challenged" as far as electrical work goes, bite the bullet and learn what you need for each fix-it issue as it comes up. Rest assured that testing for things like appropriate voltages, broken wire connections, shorts, dead bulbs and fuses is well within your ability.