To begin your no cursing existence you can start by replacing nasty words with cutesy stuff. You know, fiddlesticks and the like. One of two things are going to happen; you'll either adapt to this way of speaking (please no) or you'll find that you want to tell yourself to shut up after saying "poopy head" for the twelfth time.
If you can't stand that level of baby talk, you might want to use more descriptive phrases. Instead of telling someone to "f**k off" you'll sound much more rational if you say something along the lines of "this conversation is going no where so I'd rather not continue. Wow, look at that, you can more accurately get your point across with a full sentence and you don't have to seem like an out of control meathead.
On another note, giving someone the finger is also incredibly unclassy. Learn how to use your words ladies, cursing is so unbecoming.