Do you know what is wrong with your turbo. Are you able to identify bad parts vs good ones? Are you able to precisely measure the center housing bore and hone and use oversize bearings if necessary? I have worked at a turbo shop for 8 years and I have seen many people try to rebuild their own turbos only to end up with more problems than they started with. Also balancing is EXTREMELY important! the slightlest imblance can easily destroy your turbo and throw parts of the compressor blades into your engine. Good luck!