You can start learning on whatever car you're driving assuming it's not a classic or something rare and valuable.

Get plenty of books and go to forums and learn from others. If you have a friend who's a gearhead, that's great, too.

Truth be told, most car repairs are rather simple - remove bolts, change out a few things, put bolts back in. In my experience, the only time car repairs REALLY get tricky is when a bolt is stuck or the bolt head is rounded off, something of that nature. That and when it's hard to get at what you're trying to take off - being able to contort around any number of objects is a valuable skill.

Just be sure to always take your time, do plenty of research before hand, and try your best not to get frustrated. If you get stuck or can't figure something out, just take a step back, take a few deep breaths and relax.

Oh! And buy tools when you need them. Start out with a set of metric wrenches, a decent set of screwdrivers, jack stands, and a hydraulic jack and go from there. A socket and ratchet set is invaluable, too.