like said above, mark the position of compressor wheel on shaft. check the shaft itself for excessive wear around bearing journals, other than that the rebuild kit is pretty straightforward. just go carefull when installing the seal rings, very much like miniature piston rings and can distort/break easily on installation, other than that, the hardest part is undoing the bolts on the turbine housing!!!! oh, a good pair of small, long-nose internal circlip pliers is very helpful.