Hi Sonnet,
I have been practising IHM for about a year now having done the VTCT course at my local college. I found the course extremely enjoyable and IHM is infact my favourite therapy that I practise.
When I started learning IHM it was pretty demanding physically, but with practice it got easier and easier to do. I still do occasionally find giving the treatment quite physically demanding at times (particularly when it's hot!), depending on how much work the client needs, but in the main I find giving the treatment quite relaxing as it is so holistic.
Out of all the therapies I practise, IHM is the most popular. I have participated in two taster days and I was continually busy throughout. Several of my regular clients also think that IHM is the best thing since sliced bread!
I think you should go for it!