Blind Hem Stitch Help!

So I've been interested in learning the blind hem stitch with no success thus far.  I'm hoping some of you fellow sewing enthusiasts can help with some of my questions:

1. I have the stitch options on my machine but not the foot. Do you have to have the foot in order to do it?
2. Do you have any sites or tutorials that you recommend to aid with this? I've tried following my machine's manual and some random 'About' sewing articles with no success.
3. When do you use the blind them stitch? I was thinking for items like hemming my dresses and skirts. Do I have it wrong?

Thanks for your help! Looking forward to your advise. Oh, and stay tuned for a delicious Sweet Treat tomorrow, and many more blog posts next week.  I've been ramping up for my birthday with tons of crafting but just haven't had time this week to post.  I should be caught up after this crazy weekend is over.