When you think is enough, assemble the button and press it few times to
check the result. If you need to adjust the button again repeat the process.

When you feel satisfied by the sound and pressure, assemble and solder again.
Put the mouse together again and do a test.

If you feel that the mouse isn't clicking correctly, disassemble and repeat the process.

Good luck with your new mouse!

Here's a video about all these steps: