Cheer up!
At least you have a booting xbox, right?
And you didn't lifted the circuit or burn the resistor by the HANA chip like me.
Then just take the above advices and try it again.
It would save you a lot of time.
If you have some flux, solder braid, magnifier(to check if points are bridged or not),
and some practice, it is worth trying it by yourself. You can buy these from radioshack or hobby shop.
In my case, I ignored above videos and didn't use flux... finally
[email protected]@ed up and found why there were advice.
After reaching your final goal, don't forget to take extra care of those soldered wires and points.(I lifted the same point twice and almost pulled out all my hair, cursing myself.)
Recommend you to use hot glue gun.
BEST LUCK TO YOU!