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Most likely you have burnt out bulbs, and you need to replace them.
Below is an image, remove the panel below the steering wheel, then remove 2 screws at the top of the cluster bezel and 1 at the left lower side. Gently pry it out using a small screw driver wrapped with tape. You may also need to remove the left side vent assembly. I recommend replacing all the bulbs, get them at your Toyota dealer before you start any work.
Let me know if can help further.
No, 1 fuse would not control half the instrument panel. It is possible (but unlikely) that you have a faulty circuit board, but I recommend trying the bulbs first.
You can also move some of the working bulbs to the non-working side and see if they light up.
Getting the cluster out is not too bad.