I have had a hernia for 40 years and my intestines go into one of my testicle, dose not hurt but wondering how bad of a surgery it would be?

Outpatient! Inguinal herniorraphy is a common procedure performed by a general surgeon. Even with a more complicated hernia, the procedure is performed on an outpatient basis. You will be sore for a week or so, but the risks allowing this hernia to incarcerate or strangulate argue against delaying repair.
Not bad. Any surgery has risks. However, routine elective hernia surgery can be done generally with minimal risks and complications. The risks and complications from ignoring an inguinal hernia are higher than having surgery. See a surgeon for definitive answers.