Ugh! I hope you don't mean you want to go back!
The procedure is to write a letter to the judicial committee that DF'd you and ask to be reinstated. Explain that you are sorry, you love Jehovah, you hate the Smurfs, the whole bit. Then hand it to the judicial committee chairman. They will arrange to meet with you and discuss it. Chances are good you won't be reinstated, but will be told to keep coming to meetings and studying. Then you submit another letter in a couple of months and try again. After 6 months to a year, you'll probably be reinstated.
The elders I've seen (and dealt with) were not hard-asses about the shunning thing. They will talk to you pretty freely so long as it is about the reinstatement procedure. I called two of the three guys on my JC when I was disfellowshipped. They both spoke with me at length and were very ... understanding is the wrong word, but maybe tolerant.
I hope you aren't the one looking to be reinstated. I'll soon be DF'd for "apostasy" and it will be a chilly day in Gehenna before they get to suck me into another judicial committee. I won't be attending the one where they DF me, either.
Dave