Welcome aboard, nice ute! nice tasmans too
1. How do I remove the middle part of my steering wheel? Like the horn ring or whatever it is?
The horn caps "pops" out, it's pretty obvious from then on.
2. My screws for my door hinges are really tight....what ways can I remove them without drilling them?
Soak in WD40 for a day or three then get to it with an impact driver.
3. What is the best way to remove the shell from the chassis?
You don't, there is a subframe but no chassis as such. Front panels off, motor out, drop the front end and then the subframe comes off.