I;ve done this on other cars, and it was fairly easy.

You'll need a fitting that will screw into the spark plug hole and attach an air hose.

The aim is to use air pressure to keep the valves closed while you are working on the seals.

Remove parts until the tops of the valves are clear, then go about remmoving and replacing the seals.

You probably have worn valve guides, too, so your new seals may only last a few thousand miles. But then again, they may last forever, who knows?

If your valve guides are worn, it's a machine shop job to rework the vlalve stems and guides. To save some money, you can remove the head(s) and carry them in.