Dont be afraid to take it apart, even if you make mistakes and go through some learning curves you will be better off for it in the end ( and believe me the end is what matters most).
There is a lot to getting a machine to run good and the little things will have more to do with it than not.
When you take it apart pay close attention to your gibs, if they are tapered, orintation and what not. They have to go back the exact way they came out( if they where installed right to begin with). And learning to ajust them right will have a lot to do with machine operation.