The 2003 Toyota Yaris is a relatively easy vehicle to maintain. Changing the headlight with reliability is no problem, as you only have to reach behind the housing for access to the bulb assembly. The components of the spare tire are easily accessible in the rear of the vehicle, keeping them ready to go in case of emergency. Removing the front wiper blade will only require a little force to pull off.
However, some things are more difficult on the 2003 Toyota Yaris. You will have to lower the glove box for access to the cabin air filter, whereas other models will provide an easy access panel. The engine coolant reservoir is not easily visible on this vehicle, making it hard to check the fluid level markers on a regular basis. Changing the center brake light will require you to remove a cover and a few bolts for access.
Hans Angermeier has produced over 100,000 videos showing drivers how to fix things on their cars. He has broad expertise on basic repair procedures covering the majority of cars on the road.