hi Cathy, we did this trip a couple of years ago from hisaronu and it could not be easier. Get a dolmus from ole to feteya(not spelt right) main bus station, it takes about 15 to 20 mins, and you will be able to get a bus/coach from there to the back of marmaris, you have to get another dolmus to the tansas in
marmaris and then another dolmus to icmeler, it sounds like a lot of hastle but once you are on the main bus/coach they could not do enough for you coming round with free water and the loverly lemon balm.
The main buses/coaches run ever 30 mins until about 9pm. The whole journey took us about 4 hours but they do stop along the way so you can streach your legs.
We paid about £30 return for the two of us, no need to book just turn up and get on.hope this helps, if i can help with anything else let me know.