Lots of lubricant...work them up slowly one finger at a time...when your four fingers in keep at it gently...lots of clitoral stimulation helps (presuming this is vaginal fisting)...pull your fingers partway out and hook your thumb behind them..again continue to finger this way untill your upto your knuckles...then its lots of slow twisting to get the knuckle in...then enjoy ......hope this helps :)
