If it still has cosmoline you will need a degreaser to clean it off with. I use brake parts cleaner. I take the bolt apart, and put it in a bucket. Take the action off of the stock. Hold it over the bucket and spray it down heavily with brake parts cleaner. I spray a lot into the chamber, and down the barrel while holding it over the bucket. The stuff that runs off the rifle will go into the bucket. I swish the parts in the bucket around. I then wipe everthing down quickly, and then oil it up.
Takes about 20 minutes from start to finish.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.