v 7 !! new laser needed

[spratster]

hello all help needed have a v 7 on route its giving out disc read errors so am asuming it needs a new laser !! have checked out prices for a laser khs-400c $54.95 but there is a drive with laser for $64.95 would it be easier for me just to replace the whole drive or could i fit the laser easy enough do i need to set laser height or what please advise a newbie before i ruin a ps2 lol