Ebay: to do or not to do?

I've never used ebay, never sold or bought anything on it.
But now I've seen something I really like, and I'm slowly cracking...

I'm asking myself a billion questions.
Should I trust ebay?
Will I get the stuff or get robbed?
How much more should I bid than the previous bidder to be sure to get it, but at the same time to not offer TOO much?

GAH...
Why, oh why I opened that page...

Tags: ebay