Really you shouldn't be scared of soldering...just practice with small things to get your precision down.
The hardest thing about modding an XBox is using common sense.
Remember things like
1) If it doesn't fit, DON'T JAM IT
2) If it doesn't work, don't throw it across the room
3) It's not a good idea to keep a hot soldering iron on the motherboard for more than 2 seconds
4) Don't grab the soldering iron by the tip...
Other than this, follow the directions and you'll be okay
