Ok, so for example, if one passage said you need to give up all your possessions to have eternal life and another said that people are saved by faith, apart from works, that would be a contradiction?
Or if we could find a passage where repentance from sin was required to be saved and another stating that it's faith and no additional effort, that would be a contradiction?
Or if it said about faith on one epistle and then only works in another. That would do it for you?
It's a matter of seeing how these two answers work together, not that they lie in contradiction of one another.
Look at it this way, if I asked you if you stayed home today and you answered truthfully and said no, and left it at that you stated a truth if you spend a large portion of your day at work.
But if asked in a different way, and asked while you were home today what did you watch on tv, and you said I watched the news, that might also be true because before you went to work you saw a half hour of the news program..
And then what if both questions and answers were written down, and someone else read those questions and answers and said wow, one of these answers must therefore be a lie as the answers contradict one another..
Whereas in truth neither answer is untrue, (if you both spent the majority of your day at work and also watched the news) and neither answer lies in contradiction of one another... it's a matter of how the question was asked what the approach to the answer was..
So you have to see how both answers are correct, and uncontradictory to one another.
The Bible is the same way, people are writing from their specific angle. Works and Salvation through faith don't contradict - if your saved works will follow, if your not saved there are no works pleasing to God. It doesn't contradict that salvation is 1.) a work of God and 2) by Faith alone..
So you approach to the Bible as a whole is to see how it goes together seamlessly - not oh wow there are contradictions.
Also, in real life eye witnesses always always have different answers to what they saw and heard and experienced when they witnessed a crime or an event. A SURE way to know whether people got together and rehearsed what they were going to say to the police is if there are no differences in what they say... so when an Apostle has a slightly differing story it's perfectly normal, also, some differences are due to what perspective they feel necessary to stress, Jesus's genealogy through Mary or Joseph, works or faith, salvation or judgment, etc. etc. none contradict one another, its a matter of seeing how it fits together.