How to get set up in another EU country.

I'm looking to move to Brussels, or potentially elsewhere in the new year to improve my career prospects.

To start my plan is to work in a bar or something similar to get myself set up and have income while I look for something more in line with my career goals.

My question is how do I find a place to rent when I have no job, and how do I find a job if I don't have a place yet and can't start straight away?

I am an Irish citizen so visas are not an issue.