fuel pump shaft replacement 94 502 mag????
 

can someone give me a leeson on how to replace the shaft that drives the fuel pump. i burned it up this weekend. is it something i can do or should i leave to a pro? it completely wore the shaft down to pieces and the pump is shot. i looked on boatfix.com they seam to have all the parts i need. do i need a pulley puller? how do i get to that shaft(cam) to replace it ??? any info would be great..