Doing MSQ is different and recommended to have at a minimum a full understanding of the healing job. Might want to practice on lower level dungeons at least once. While MSQ are not that hard , depending were in MSQ you are in, you want to have some healing experience and not be carried or later on criticized for poor performance. Once you hit HW near end as a healer can be a pain. Must learn to interrupt your casting to stay alive and so on.