Something I’m discovering at the moment is the need to become less legalistic about confession. Trust the priest, unless you have an explicit reason not to trust him. If he needs more information, he’ll ask.
At the same time, I’ve been advised a lot in confession to explore more deeply the origins of my sins. It’s fine when you’re a child to just say “I used God’s name in vain 3 times, I hit my brother 8 times” and so on. It’s good to go a little deeper as an adult, and not use the ‘shopping list’ approach as an excuse not to address the stuff that, while not sinful in itself - desires, patterns of behaviour, things in our past - might be keeping us stuck in patterns of sin, confess, sin, confess, without much progress. We’re called to confess our sins, not just a list of generic sins, and sometimes the root of the desires in us that keep us sinning can be much harder to admit to than the longest list of mortal sins taken from a prayer book. As a priest told me recently, confession is not an exercise in ritual purity, but in drawing closer to God.
Of course, that’s not an excuse not to confess *mortal *sins by number and type, nor to turn confession into psychoanalysis.