The biggest issue is altitude and how or if it will kick your butt. There is no rhyme or reason to who or when it will hit. Even young and full of vinegar you need to be fully aware of altitude sickness especially in run and gun mode. Lots of threads on it here but just want you to be aware of it, know the symptoms and don't mess around with it. It can kill a 21 year old as fast as a 50 year old. You will have no altitude acclimation time which can be really tough hump to get over and be ready and prepared for it. I am not being a Debbie Downer but just a experienced old guy that has been at altitude even when I was 40 and really good shape. Be aware of it, be prepared for it, make the right decisions and ACTIONS to mitigate at lower altitude IF it surfaces and just accept it. I have had to get 2 pals that had to go down FAST over the years from it and it was real close on one of them for serious concerns. He could hardly stay in saddle on way down mountain and was rushed to local clinic for treatment.
Average body takes 2-3 days to acclimate FULLY over 8K no matter of age. How good of shape will determine IF the acclimation process kicks butt or you can get through fine. You are a flat lander in TX so be very much aware of this potential when you hunt.
20 years ago I added 3 days to front end of my hunts at altitude so I could start the hunt good to go. It was extremely tough with family and kids, I know but you are spending a lot of effort, money and time into a hunt so sometimes you have to do the best you can. Really tough to balance life with these types of hunts. Wish you lots of luck!
This is nice page on altitude as a reference.
Guide to Altitude