The benefits are prevention of: protracted symptoms, bleeding (that may also lead to anemia), prolapse (internal hemorrhoids protruding out), necrosis of external hemorrhoids (the tssue dies) which is associated with sever pain especially with bowel movement.
You could expect minor post-operative bleeding, anal pain, infection at that area, inability to pass urine (urinary retention- mostly because of pain).
The risk of recurrent symptoms following such treatment varies with the extent of the disease, with a 10% recurrence rate for Stage I and II disease, and 30% for Stage III disease. Hemorrhoidectomy carries a 5% risk of recurrent symptoms.
Grade Two hemorrhoids are at the first stage of hemorrhoidal prolapse, which is to say that they protrude from the anal canal during a bowel movement but retract back into the body upon completion of said bowel movement.
Grade Three hemorrhoids protrude from the anal sphincter during a bowel movement and do not retract upon completion, but will stay inside if pushed back in manually. Grade Three hemorrhoids have a tendency to bleed more often and are generally easier to inflame.
Grade one and two are treated medically.
Grade three and four are treated surgically.
There are multiple surgical technics. I advice the Longo procedure. Procedure for Prolapse and Hemorrhoids (PPH)
PPH uses a circular stapler to reduce the degree of prolapse. The procedure avoids the need for wounds in the sensitive perianal area thus reducing post-operative pain considerably, and facilitates a speedier return to normal activities.