I will tell you i was really nervous about doing it. I love to cook, just love it. But much like cooking, sometime when you really want something to go right it makes it 10x harder than it should be.
I've heard people go wrong in 2 big places:
1) Sanitation. You have got to sanitize EVERYTHING that will come in contact with the beer. That means every pot, spoon, gasket, nozzle, tube, bottle...everything.
2) I've heard that a lot of people have issues with yeast distribution, and priming sugar distribution.
3) Really, just make sure you follow the instructions to a 'T'. Read them before you actually do it, then if you see a term or technique you don't know or understand, look it up.
I think it's important to take your time, and take an easy kit to begin with.
This is the next kit I'm using, and I used a truebrew last time and it went great.
http://www.brewgadgets.com/BrewingInstructions/amber.htmIf you want to order:
http://www.brewgadgets.com/truebrewkits.htm