where can I get a petition to challenge a will for the state of oklahoma

There are a lot of legal things that some very intrepid people (willing to educate themselves with lengthy research) can do for themselves.  Drafting a will contest petition is not one of them.  It also sets in motion a lot of legal things that even lawyers who do not limit their practices to this kind of thing cannot do well.  Give it up.  Hire the best lawyer you can afford, but make sure the skill set is in estates and trusts AND litigation.  Just any litigator will also need an estate lawyer and just an estate lawyer will also need a litigator.   To your success!  Gale Allison