S80 dci coil
 

Are these very difficult for a "lay person" to change out? Thanks!

I'm not sure what DCI means. But assuming it's a COP (coil-over-plug, as opposed to single coil with distributor and plug wires) coil, all you need is one Torx screwdriver for the cover and one metric socket to release the coil. Would help to know which one of the six it is though.