It can be tough if you have never done it, but hell, some of them are tough with experience lol 500 is alot but it does take several hours to do, see if you can find a friend in your area who knows how to do it, may be able to get a good deal that way. I do mechanic jobs on the side but i am about an hour away so I would be no help to you I am afraid. good luck.
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Keith Morgan
Forney Bass Club
Triton TR 22, Merc 225 EFI
Firefighter, City Of Garland