In many ways, Saturday is your key day, in order to secure a vital, changing, growing, and exciting Christian (or church) life.
Saturday is the New Covenant church’s “Preparation Day,” (as it were).
On this day, you ought to get your “ducks in a row” regarding Sunday. This may mean preparing yourself, your family, and your finances, etc., in such a way that frees you up, for a Lord’s Day (Sunday), of the best worship and rest.
One very important factor is the need to get a good night’s sleep. Do not stay up late into Saturday night (or Sunday morning). A well-rested body makes for a better rested soul on the Lord’s Day.
Bottom line: make Saturday your day to especially gear-up for Sunday.