Hi again,
Just a note that if you look at the website I mentioned you will see alot of woman finding out that they shouldn't have been put on it while they were breast feeding. I haven't looked into that issue myself much but I do recall woman discussing it in the posts and were very worried due to complications and some issues their babies were having. might pay to have a look.
If you do go ahead the insertion was uncomfortable but the the removal was fine and I had SEVERE thrush at the time (just one of the many joys of the mirena) cheers Missy