we had them professionally installed by a contractor.
use separate mat from the wood. dont use the thin "wooden" strips...theyre softer, creak more often, and dont look as "professional" after the install. the only thing is, theyre a lot cheaper.
make sure plumbing is taken care of and be aware of any wetspots that might weaken the wood...which would lead to its staining and ultimately, replacement.
we love it.