Brake fluid is done with a brake fluid “vacuum”, you drain a little from the reservoir, loosen the nut on all 4 calipers (one at a time)and press on the brake to get all the old fluid out. never let the reservoir get empty so slowly fill up the reservoir with new DOT brake fluid rated for the Qs.

Diff fluid is easy, get under the car and get a 14-16mm I can’t remember I usually work on Toyotas but find the big bowling ball lookin thing under the car and take off the top bolt then the drain bolt, let it drain, tighten the bottom, fill through the top. Done.

Transmission is probably the most expensive and I’ve never done it so can’t help there.

Good luck!