What do you think are the chances of being rehired? Any helpfull tips are welcome?

I worked at my former job for about 3 years and then about 8 months ago i was fired from because I was told to do something and I didn't do it. (stupid on my part) I had a bit of history of being disruptive but I had a very good attendance record ( never missed a day and i work for people a lot!) The managers like this so i think that is why they let me stay for so long. Well about 3 months after i had been fired I wrote a letter to my manger apologizing and ask for a reconsideration. I didn't receive a reply for him. About two months i went to go see him myself and asked him if i can have a talk with him, he said ok. We talked and i explained to him how i desperately needed the job back and he understood where i was coming from and tol me that he might but he wants to speak with the other manger and see was he thinks, and he also told me that he doesn't know if it would even be possible to rehire and that he would take to human resources and find out. He told me to call him the next day. I called him and he told that he spoke with the other manager and that they agreed that it might be possible but theydidntt feel it would be a good time at this time because of the people currently working there. ( part of the reason i was disruptive was because a good friend f mine worked there and we goofed around, we are not even friends anymore but i dont know how to tell that to them without looking like im lieing) Well two months after this meeting i called human resocure my self to see if it would be even possible to get rehired. She told me that it would be possible but i have to work somewhere else for 6 months to prove i can hold a job on good terms, next month it will be 6 months. Does anyone have any advice input or anything of the sort on the matter. Should i just give it up? or try