Only advice i can give is remember you don't have the focus healing power as WHM (unless you obey EOS and focus her heals), but you have pretty much infinite MP so you can spam heal a lot more. Im sure some pro healers have it nailed though, our FC healer can solo heal a lot on his SCH, i find it pretty impressive haha. Sometimes Selena is better in some cases, for example our SCH uses selena all the time in coils for the speed buffs as healing is not an issue.