have you had children by section or vaginally? If the latter, it will be fine!
I didn't feel it at all - painless throughout but apparently the cervix can spasm which is painful. My GP said if this happens, she would squirt a pain killing gel to stop this. You can always tell them to stop as well!
Side effects
If you have had effects from other contraceptives such as weight gain, headaches, acne, bloating, mood swings then these are the most likely side effects you will get. It is the same hormone as the mini pill I believe.
I never had trouble with the pill so I am not having trouble with mirena. There are lots of threads on here so search for more info.
I have found I am slightly hairier - my top lip is a bit darker but hardly a problem. My libido is suffering as well, but we are coping with this.
I do have periods, somewhat erratically, very light (I use a mooncup 12 hours at a time and its not full) but they now last 7 days not 4. Much longer in between as well, I was 23 day cycle but now average 45 days. I have had it since last November.
I do sometimes get spots and I definitely ovulate but less frequently.
DH cannot feel it. The 'strings' need to be tucked in so to speak.
I am a happy customer.