You manually insert the sure t - so simply push the steel tip into the skin, ok there is slight discomfort I won't lie but once in you shouldn't feel a thing, unless you have a bad site and then it's best to change asap, it's rare to get a bad site and of course you'll know when you get one, i've inserted these into my chest and not felt it once in, I wouldn't go back to soft sets now though particularly as you've had kinked sets, the only way you will know for sure is to try them