if you feel that *searching for word* stressed about the possibility of putting your own spark plugs in, than maybe this one should be left to others. just know that you're going to pay someone about 100 dollars or so (possibly more, with 02 sensor) to replace stuff that would take less than an hour (even for the un-initiated) to replace. if you're alright with that, then find a local dealer. doesn't matter how long it actually takes them to replace a part, they have standard set hours that get charged based on the work you do. So you should be able to call a dealer and get a quote over the phone...
96 LeSabre (L36)
95 Olds LSS (L67)