I'm a biologist, not a nurse, and got to this thread with a search. For me, it doesn't matter whether I'm on my back or my side, having a cystogram, cystoscope, urodynamics, or, most recently, a Foley due to blocked urethra and inability to urinate--these "tiny" instruments in the urethra are horribly painful. These catheters are nuts. The lidocane gel does nothing, except hurt when put in the urethra. Yes, urologists try to threaten the patient with the idea I'll self-cathing if dilation doesn't work. They may as well tell me I'm going to stick a pen in my eye. Dig out the anesthesia, Bubba, or stay away from me.