Hang on to your shorts because I'm gonna light a firestorm
#1 I don't have access to the original fragments or documents to do my own homework
#2 I don't don't know Greek and still have to rely on dictionaries
#3 Just as there are versions today, there were versions back then; which were real and which were fake
#4 How much truth is presented in papers, documentaries, and archaeologists of today about what is discovered, when and how
#5 Already fluent in two language plus a working understanding of 3 others, I know that translations are very important to local customs - both Greek and Hebrew of today are very different from those language 2000 years ago.
#6 I'm not Jewish to understand their customs to grasp the meaning of the words Christ spoke to the Pharisees, though I'm learning
#7 Aside from the awesome power of the written word of God which is protected in most translations, we do not know what's missing seeing how the canon was finalize by the Great Assembly of Jews for the OT up to 70AD and seeing how Jesus said they were vipers, how do we know we have all the books or the OT?
#8 The NT canon is just as questionable when you review how it was assembled over time splintering into eastern and western "christianity". Even Martin Luther wanted to remove Hebrews, James, Jude and Revelation from canon. Why is it the 1 & 2 Maccabees are included in all "christian" religions except the protestant ones?
#9 The oldest known text of scriptures are the collection from the Dead Sea scrolls, but the information about those non-canon books are not so easily available and there's a lot of questions still unanswered 40 years after their discovery on scrolls which have yet to be published.
I highly recommend seeing what isn't included in your protestant bible and why -
http://en.wikipedia.org/wiki/Biblical_canon
So no, I'm not qualified, nor am I worried about it, because I have the Author in my heart and I have enough to go on to learn the rest from Him for myself. Unlike many I'm not afraid to read non-canon books. Jude and Peter quote the book of Enoch and seven other books are mentioned within the scriptures which were not chosen to be a part of it like the book of Jasher. I do not make the written word of God, God. Jesus is the Word of God, not the papers we have in front of us.
I hope this answered your question.