How do I operate the drawbridge?

Hint 1 of 9:

Light up each niche

Hint 2 of 9:

With fireflies

Hint 3 of 9:

If you don't have a firefly, see another hint in this section

Hint 4 of 9:

Operate each handle in the following sequence

Hint 5 of 9:

Start with the back left handle and click on it once,