Well I don’t think anyone enjoys the installation but it’s over and done pretty fast and shouldn’t cause further discomfort if done correctly.
it’s mainly plastic, like the mirena, with a copper facing on the arms, rather than being metal all over.
If you do get one it’s well worth getting it done by someone who does a lot of them.
The company behind natural cycles is currently being sued. It’s not a method I’d rely on - it does work IF your cycle continues to be regular, however as you age you can experience cycle disruption and illness etc can cause small alterations as well.
There should be much better contraceptive options, there’s woefully little new product development or research on it.