1) Here a little, there a little (Isaiah 28:9-13): God did not organize the Bible so that all information on a given subject falls in one chapter or book. The whole Bible must concur before we can truly call a theological concept "truth."
2) A positive approach (Acts 17:11-12): God left us a wonderful example of a people who sought to prove the truths of God rather than disprove them. He can work with those who have submissive minds, receptive to His revelation.
3) A desire to please God (II Timothy 2:15): Our study should be intended to merit God's approval of our lives. He is not impressed with scholarship or intelligence, but He does respect godly living and spiritual growth (Psalm 111:10; II Peter 3:18; I John 3:22).
4) No private interpretation (II Peter 1:20-21): The Word of God and the understanding of it are revealed by the Holy Spirit (I Corinthians 2:6-16). Any personal understanding or interpretation must agree in all points with the Bible, or spring without violence from its principles (cf. II Peter 3:16) - otherwise an idea is nothing more than an opinion and maybe a dangerous one.
5) Humility (I Corinthians 8:1-3): It is a good idea to remember that many others, probably wiser, have faced the same questions before us. The history of the true church of God through the centuries should be considered and the decisions of its leaders taken seriously.
6) Seek counsel (Proverbs 24:6): Not only should one bring vexing questions to the ministry, but one should also seek wise advice from brethren, both inside and outside one's normal circle of friends. After mentioning it to others, give them time to study the subject thoroughly themselves and reply before drawing any conclusions.
7) Prayer and meditation (Psalm 119:33-40, 97-99): Seeking God's will and considering the ramifications of our ideas are absolutely vital to proper Bible study. Others, weaker in the faith, may not be able to survive our "spirituality" (I Corinthians 8:9, 11-13).
If we apply these principles to our Bible study, we will go a long way toward diminishing the confusion over doctrine both within and out of the Body of Christ. And, importantly, we will be heeding the advice of our Elder Brother, "Take heed that no one deceives you" (Matthew 24:4).