How to make it as a Composer...

You can try and become a Composition Lecturer and get pieces played and performed on the side.

3. The ability to write music. (yes, it is needed).

Very arguable. I know people who are only writing music because they know people, and there circle of friends are all into the same music and are 'coincidentally' all on the music panel for government grants giving each other free government money for nothing.

i. a personality. Who likes working with a dumbass? Who likes working with someone who is always late? Who likes working with a smartass?

Having a personality that is marketable, meaning not normal can also help. Fake, and crap but welcome to capitalism.