Brian Russell has an intriguing list of prayers that Ancient and Medieval Christian scholars prayed to prepare themselves for reading the Word. Here's one from the Venerable Bede:
May your Spirit, O Christ, lead me in the right way, keeping me safe from all forces of evil and destruction. And, free from all malice, may I search diligently in your Holy Word to discover with the eyes of my mind your commandments. Finally, give me the strength of will to put those commandments into practice through all the days of my life. Amen.
I generally just start reading my Bible without any particular preparation. But that should change.