Other things to consider before you tear out any walls is what is in the wall, and what support is under the wall. The attic or basement can help you to see if you have any plumbing or electrical lines in the wall area. Mostly you will be concerned about any main lines.
The next thing is the existing wall load. There are live loads(you and your stuff)and dead load,the house above the wall.Make sure the beam going in can carry the wieghtand that the posts going down(king and jack studs) are landing on more than the flooring.They should have solid support underneath all the way to the foundation or a beam.
Follow the path from top to bottom.
The up side is mabey you have trusses and there is no bearing wall!!