The use of 'one'

Sometimes I get confused using English, once I think too hard about it.

Like today 22:00 I began wondering whether the possessive form of 'one' had an apostrophe. So I'm thinking, " Is it ones'"? or "Is it one's"? In fact I began to wonder how on earth I knew that 'one' was pronounced 'won'. I couldn't remember who taught me the proununciation of 'one'. Anyways, the word looked so strange.

I searched around on Google and found this link: http://grammar.ccc.commnet.edu/GRAMMAR/one.htm which really gives a lot of information. Eventually I gathered that possessive form of one is in fact one's.

So...so...now I'm cool again.