you mean manual hand stretches like [words=http://www.mattersofsize.com/forum/penis-enlargement-newbie-forum/1597-dlds-first-routine-i-gained-2-inches-with-this-routine-full-tutorial.html]newbie routine[/words]?
get something to warm up before, heating pad or shower?
then dry off and use baby powder for grip. dont start off at max force, your skin needs to get used to being handled this way. get a decent ok grip and do a shortened routine. after a week add more stretches and more force and time... build up to the full routine over a couple weeks to a month.
took me a couple weeks to get over feeling like I was rope burning my cock skin. baby powder helped a LOT.
if you need a device that will be both comfortable and efective, perhaps [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]penomet[/words]?
if you mean while using [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words], do the velcro mod and/or get [words=http://TLCTugger.com/MOS]vlc[/words] [words=http://TLCTugger.com/MOS]tugger[/words] for comfort. the noose methods are known to be painful yes.