Buying a house for the first time in your life is a significant achievement; however, your credit score acts as the guard standing at the entrance point. Everything you do related to paying bills is carefully monitored by the lender. One missed payment may affect your ability to buy a house in the future.
You need to have some mechanism working on its own. Calendar approach works fine for someone; however, for me, it is rather a time consuming task. Dealing with the bills from the cards provided by Chase, Citi and Amex is hard. You should think about something else apart from your payment deadlines such as picking colors and arranging inspections.
The best solution here would be to consolidate all the billing cycles. Call your credit card issuing companies and ask them to change your payment deadline to one particular day in a month, e.g. 15th.
Next step is to set up your autopay for the minimum payment, which will act as your safeguard to protect you in case of mistakes made by you. You are able to add extra payment if necessary in order to pay off everything.
In order to monitor your debts and obligations in general, you are recommended to use one of various budgeting applications, e.g. YNAB or Rocket Money. They will give you a total overview of your debts. It will help you manage your debt-to-income ratio.