lefty bass players website:
http://www.leftybass.com/
Didn't we cover all of this in this thread?
http://www.talkbass.com/forum/f1/lefties-60068/
My 2 cents:
I'm a lefty bassist also. I had an 80 or so year old German bass converted (bass bar and soundpost switched, plus all the other stuff like the bridge, nut, fingerboard, etc.).
...hopefully this will not give any righties who object to such a bastardization of an otherwise fine instrument a case of the vapors....
I've also got an old Kay (my first bass) with the same work done, and am in the process of getting an EUB made for me. Has it always been convenient? No, but it hasn't ruined my life or my professional career (although I've never pursued the classical thing, where it could possibly be a major problem). Did it help me learn the bass quickly? Absolutely (I picked it up in college after having played lefty electric for about 5 years). The learning curve on the upright is so tough at the beginning that I feel like if you're fighting your natural inclination, handedness-wise, on top of the struggle just to get around the stupid thing, you're fairly likely to be frustrated enough to put the thing down (or through a wall). Left-handed uprights are becoming more and more available, and why make it harder on yourself than it has to be, just in case you need to rent an instrument somewhere down the line, or want to sit in but don't feel like dragging your upright to the jam session?
The other thing that no one has mentioned in this thread is that there are degrees to which all people are left hand dominant, right hand dominant, or ambidextrous. I have always done everything left-handed. I know other left handed people who do some things righty, like using scissors (have you ever tried to use those cheap elementary school scissors with the wrong hand? no wonder I did so bad in art class!) And many lefty are more ambidextrous out of necessity, like those (like my friend's dad) who weren't allowed to write with their left hand in school. If you're a fairly ambidextrous lefty, why not at least try righty? I can't do it, but maybe you can.
But if you can't, don't feel pressured into it, and don't let it stop you from playing the instrument you want to play. And certainly don't listen to some know-it-all righty talking out his a**; after all, if the left hand is the one "doing all the work", why doesn't he as a righty, switch to lefty? Why have all string instruments, across the world, throughout history, been built “righty”? Give him a lefty instrument and watch him try to fret it with his “dominant” hand, it'll be amusing...