dude, smartxx has a very detailed instruction manual, and with the lpc rebuild its even easier.
first what chip did u get v2 or LT OPX or v1 depending on that you go
here then click on the one u want, ull want the top row since those are for 1.6 boxes and then u click the install you want......im gonna guess and say u got the v2 chip and with the 1.6 box, ull want to do the pinheader insatlll since its pretty much the easiest. then ull click
here and follow the instructions, i suggest opening ur xbox and making sure u know where ur going to be working before you start.....look at the pics then the xbox before you start and make sure u know where everything is that you will be working on.....print out the instructions and keep em with you so u can go step by step....if ur doing the lpc rebuild then just dont do the last step in there......make sure u take ur time if its ur first one good luck i guess