I am considering building a PC. I am 14 years old and I do not have experience with putting together equipment like this, so I have a few questions:

1. Is it difficult to build a PC?
2. Where should I order the parts?
3. Where could I find detailed instructions on how to put it together?
4. How much money could I save if I built a PC instead of buying one?

These are my specs for an Alienware Aurora 7500. Tell me what you think I need to change. Also, if you could post your PC's specs and how much you paid for it, that would be great.

Processor: AMD Athlon 64 X2 5200+ Processor w/ HyperTransport and Dual Core Technology
Operating System: Genuine Windows® Vista Home Premium
Chassis: Alienware P2 Chassis with 700 Watt Power Supply
Graphics Processor: 256MB NVIDIA GeForce 8600 GTS
Memory: 1GB Low Latency DDR2 PC2-6400 SDRAM at 800MHz - 2 x 512MB
System Drive: 250GB Serial ATA 3Gb/s 7,200 RPM w/ 8MB Cache
Monitor: 20" Dell 1600 x 1050 UltraSharp Widescreen Flat Panel - Supports Blu-Ray!