That's great, Joan.
My refrigerator likes to eat up defrost timers. I YouTubed it some years ago (I didn't even know it was the defrost timer that was bad) and there were plenty of videos that showed how to replace it. In my fridge, access to it is fairly easy. I must have replaced it 3 or 4 times, so doing it myself has saved a small fortune. hehe, I even keep a spare on hand.
Also repaired my furnace using YouTube. One of the most common problems with modern furnaces is a dirty flame sensor. Well, I was able to replace it myself (of course one could just clean it but the replacement was $9 on Amazon). I keep a spare flame sensor on hand now too.