I hunted unit 18 for mulies this year, which is the next unit over to the west. It is STEEEEEEEEEEP!!!! I didn't get out on other units but it looked like unit 13 and 14 was pretty much the same. Unit 18 had areas for long shots though and also had some thick areas.
I live in FL and in great shape but I was not ready for those hills.
The problem I had was I started to get blisters on my feet. You need boots that fit well and give good support on uphill/sidehhill positions.
Do lots of cardio and get on the treadmill on the highest incline possible.
Do lots of lunges, just walk accross your yard doing lunges, back and forth until you can't move. Then you will be ready.
Of course taking care of your feet is priority number 1.
At first sign of hotspots or blisters, put something on them to keep them from geting worse..
I did get a nice 5x5 mulie,it wasn't a monster, but we did it ourselves- self guided.
It took me 5hrs to walk out after bagging my mulie. It was all uphill, even the sidehills were uphill!. I may try unit 23 for elk or mulies or maybe even go for elk in unit 14. I'll have to do more research.