You will encounter all three.
I suggest you become familiar with basic maintenance of your vehicle. Learn to do basic inspections like steering and suspension systems. Knowing common failure points of your particular vehicle is also important. Spend time on vehicle specific forums for what you drive and learn about the weak spots, because they are there. Having diagnostic tools with you such as a basic multi-meter and an OBD2/CANBUS scanner (for newer vehicles) plus some forum of repair manual. Also, try to do most of your maintenance with the tools you are carrying with you so you know what you have and what you might need as well.
Logistically, plan flexibly. Don't try to pack every day full of things to do, leave room for error and divide things you want to do into "musts" and "wants" where you can shed "wants" as time starts to get tight. Also, don't be afraid to do a full abort. We've had a few trips where the weather wasn't cooperating, a kid was sick, or the X acted up and we just chose to go back home rather than be miserable or stuck. Those were learning experiences and there's nothing wrong with that.
Navigation is probably the easiest to deal with IMO. Don't rely on a single piece of gear to do that job. I load maps on my phone, tablet and keep a DeLorme Gazetteer for the area I'm in. Also, research the area you are going and make sure you have maps for that area for off-line use on your equipment. I miss-judged a trip a few years ago and didn't have the full map available and was in a 0 cell service area. The Gazetteer came to the rescue to some extent but it was still an educated guess about which route to follow that got me off the mountain. Again, if all else fails, go back the way you came or at least till you can get some service.