I have been playing with catheters for several decades. Lately I have even successfully inserted a 28fr latex catheter with no problems at all. The secret, other than being very sanitary, is to inject plenty of KY jelly up the urethra before inserting the cath. That will make insertion much easier, and removal will not be nearly as painful, either. The last time I tried this I did not even have any sign of blood. When I urinated normally there was almost no pain at all.