Help ! Installing debug build on Free build

hello friends,

I need help in installing debug build on an already installed retail build of Win2K/XP. I have found the article in DDK documentation but it warns that the Service pack of both builds must be same and gives the list of which files to copy including HAL and NTOSkrnl.In the past I used to install it on a single machine but now I want to make a dual bootable machine.
I have never done this before.. so please can someone help me. I have WinXP sp1(Win2k Sp4) installed and is having WinXp/Win2K checked builds and respective service packs.

With Regards.
Cheema Dev