Hello Shoshanna and welcome to SI.
I assume you are refering to the Finney sermon titled 'How to Promote a Revival' which is lecture #3 in his series titled Lectures on Revival. In this sermon he talks in detail about how "breaking up your fallow ground" is done.
This is a very challenging message and one that had tremendous impact on me. I would suggest that you follow Finney's advice in the following paragraph from that message...
[i]Self-examination consists in looking at your lives, in considering your actions, in calling up the past, and learning its true character. Look back over your past history. Take up your individual sins one by one, and look at them. I do not mean that you should just cast a glance at your past life, and see that it has been full of sins, and then go to God and make a sort of general confession, and ask for pardon. That is not the way. You must take them up one by one. It will be a good thing to take a pen and paper, as you go over them, and write them down as they occur to you. Go over them as carefully as a merchant goes over his books; and as often as a sin comes before your memory, add it to the list. General confessions of sin will never do. Your sins were committed one by one; and as far as you can come at them, they ought to be reviewed and repented of one by one.[/i]
Make a list of things and like he says, be very thorough. This isn't some kind of punitive measure so that we might feel bad about ourselves but, it is a honest searching of our hearts to allow God to do some cleansing. When you look at the list of things you have done in black and white, it is very humbling and brings deep thanksgiving for the wonderful mercy, grace, and patience of our Lord, it also drives unforgiveness out of your heart when you see just how much you have been forgiven.
For me, one thing this brought about was the conviction that I needed to make some past wrongs right with others. If you take this word seriously God will bring about change, it will be inconvenient and uncomfortable, but it will produce fruit.
By the way, you can listen to a reading of these lectures which were recorded by one of our own here on SI, Robert Wurtz. Here is a link to the recording of [url=https://www.sermonindex.net/modules/mydownloads/singlefile.php?lid=4106]How to Promote a Revival[/url]