It is never too early (or too late) in the week to prepare for the Lord's Day. One valuable 19th century Presbyterian work that aimed to assist both ministers and church members in preparing to make the most of the day apart by God for his worship is Gardiner Spring (1785-1873)'s The Power of the Pulpit; or, Thoughts Addressed to Christian Ministers and Those Who Hear Them (1854).
It is full of counsel to preachers concerning the highest task to which they are called as God's ambassadors, stressing the importance of personal piety for ministers, and a reliance upon the Holy Spirit in the work of the ministry. Spring puts the utmost stress of the need to view preaching of the gospel from the pulpit as a minister's highest duty, and consequently, he also highlights the need for church members to pray for their pastors, to give diligence to the hearing of God's Word, and consider that God's Word is being proclaimed to them. There are duties of the pulpit for ministers, and duties of the people who are present to give ear to God's Word. The counsel that Spring offers in regards to both comes from an experienced minister and with pastoral concern for the exaltation of Christ in the pulpit and in the hearts of the people. Be sure to download this work and read over it prayerfully as you seek to make the most of your next Lord's Day.