Hello @SofiaSmithJewelers, welcome back to the Community!
I can't imagine how stressful reconcile issues can be, especially at the end of the year.
Not to worry though, you've come to the right place for assistance!
I have found an article that can assist you with reconciling your account(s):
Reconcile an account in QuickBooks Desktop
This help document is super detailed and has several helpful tips that cover all aspects of reconciling.
It also links to another article on how to enter the proper opening balance.
If you run into any other issues, please reach back out so we can assist you further.
Looking forward to hearing from you!