Fair warning; timing belt replacement is a hell of a lot more complicated than spark plugs. Unless you are really confident in what you're doing or willing for your car to be out of commission for a few days I would recommend against a timing belt job.
I'm pretty confident after watching some videos... what exactly do you consider the hard part to be?
I've done a few on FWD cars. The belt is hard to get to, for one. Second, you'd better be
real damn sure the cam(s) are timed correctly when you put it back together, or it 1. won't run, or 2. will destroy the valvetrain. It's also hard to get the belt on the pulleys, unless you can back the tensioner off a lot.
That being said, both the ones I did ran afterwards, so... it is possible. Just not much fun, and there is some risk involved.
Here's me doing the belt on my friend's Escort ZX2: it had some sort of mechanical intake cam advance thing that we were supposed to reset, but required pulling the cam gear and using a special tool... I put it back together without doing that, and it ran, but the cam advance was disabled (didn't hurt the motor, just didn't make as much power on the top end).
(EDIT)
For the record, I know what I'm doing and it still took me about 4-5 hours to do it. I took it slow and made sure I didn't screw anything up. The belt itself cost $50, the mechanic wanted $300 to change it. My friend was flat broke, so I offered to do it.