How Do I Figure out...

[BigBear]

How do I figure out if a wall is a supporting wall or not. I've googled it but cannot follow the beam into the foundation or any of the other tricks they mention. I have a 3 foot wide "separator" wall in the bathroom. I would like to see if it's possible to knock it down... give a big guy some more room in there.

Also, as a sidenote, how hard is it to move plumbing and stuff a few inches laterally?

P.S. The snarky "call a conctractor" posts, while cute/funny, don't help. HA. I'm stressed enough about money, can't really pay a remodel person, but if someone can walk me through what to do, I can buy a few beers, etc.