Congrats on the college program! I too am on the spectrum and have been labeled “high functioning.” I also have a slight obsession with all things Disney and visiting the parks on both coasts

. So I totally understand some of the challenges you’re concerned about.
Sensory overload is definitely a challenge for me in the parks. Knowing the parks inside and out helps mitigate that since I don’t have to think about how to get somewhere or where to go if I need to get out, and also knowing the Disney system (like how to get through security efficiently, how transportation works, where discounts work, etc) helps so I’m trying to process one less thing at any given moment in the parks. There are definitely no-go areas for me in some of the parks (like the chaotic fantasyland area behind the carousel near the arches between Pinocchio’s Village Haus and Winnie the Pooh) that I just avoid. If you’re by yourself, try to stick to the areas that are easier for you to deal with.
When I’m in the parks, I usually carry a Duffy bear in a Sully costume. It allows me to squish the bear/stroke the soft fur and self soothe (and not stim so obviously) when I’m getting overloaded. He also attracts a lot of attention (from CMs and guests), and sometimes those interactions help refocus me in the moment on something small and specific so I’m not trying to process everything at once. Is there something you’d be able to bring with you when hanging out in the parks that would help you relax and refocus yourself?
Since this is going to be a day-to-day challenge for you, self-care is probably going to be really important! Finding a way to integrate something you find soothing during your breaks and lunches while working may help with sensory overload at work. Listening to Yo-Yo Ma play Bach cello solos really helps reduce my sense of overload at work when I’m starting to feel overwhelmed, so I make sure I always have that music available to me and some headphones.
I also saw that you said you can usually manage because you have your support system with you. If you’re not already planning on it, set up some regular Skype sessions, phone calls, texting time, etc with your support system back home. Just knowing that you will be able to reach out to your support system and they’ll be available for you at specific times can be super helpful so you don’t feel isolated and alone. I know for me the more connected I feel with the people who are important to me, the more I am able to cope with some of my other challenges like sensory overload.