Cambelt was pretty scary for me, but it was in my early days of mucking around with the car. I don't think I'd be too nervous about doing it now. It's all about taking your time - as well as making sure you've got the right parts. Clearing everything out so you have access is what takes the most time. Don't try to skirt taking all that stuff out, because it'll just make more work for you. Make sure you put it all back together properly too - I had a little clip just out of place on my pancake pipe, and the moment any pressure went into the system, it blew off and I lost all power. When I had no idea what it was, that was proper scary.
It's a bit of a pain, but the good news is that most of the jobs that involve the most work are the kind that you don't end up doing all that often. There are also some really good videos on YouTube, either on the mk4 Golf, which is more or less the same, or on the Leon itself.
Clutch is something I really should be doing, and don't really have any excuse not to do. Hopefully I'll get round to it before it gets round to failing on me.