Both can be dangerous if they are bad enough. The tie rods are what actually turn the tires for you. If they come apart, you will only have control over one of the tires. The other will go in any direction it wants. As far as the ball joints, they can cause the wheel to buckle if they come apart, so as I said, either or can be dangerous if they are bad enough.
As far as replacing them yourself, the tie rids are not that hard to do. However, you need to have the vehicle aligned after replacement unless you get it back to the exact same spot it was originally in. As far as the ball joints, that is a big job. Most of the front end needs taken apart to replace them. If you have no experience, I would recommend have it done by a professional. However, if you have some mechanical ability and can get your hands on a good repair manual, you should be able to do it.
Let me know if you have other questions.
Joe
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Friday, June 19th, 2009 AT 7:17 PM