I've bought a lot of things online, from various places and have never had any extra money taken from my account.
There's nothing to worry about ordering online if you purchase from reputable stores. If you order from dodgy sites, expect to have problems. You're more likely to get your card details stolen from a dodgy resteraunt (It's not hard for waiters to clone cards) or tampered cash machine than online.
Currently no job, flunked my GCSE's and jobs in this town go so bloomin fast. Quite a shame as I was expected A*'s.
It's all good though, currently studying for HP IT Essentials (basically an A+) and CCNA 1 + 2. If all goes well I should have those soon enough and start looking for something better than stuffing envelopes.