Jochen is dead on: if you have a deadline, make sure that it will run on that day. Fix the important parts first, that is, read up on how to jack the car up. Best by the rear and front suspension, they are rubber mounted and heavy. Good shove before crawling under, don’t risk your life.
Change the brake fluid, make sure it stops, new tyres. Look for structural rust.
Make sure the engine runs and give everything a good clean. Eliminate rattles, new oil, go through the transmission.
With the time left you can have a look at the blowers, but I am sure you will find the cure. I‘m 23 also and my XJ is just a year younger, but not well documented at all and with its own problems, many of them fixed by now.
I‘m sure your grandfather in law will be very happy even if the fans are not in order yet, should you not come around to them by then.
Texas, even then, prioritize. Is the AC still on charge, how long did it sit?